<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Session Export</title>
  <style>
    :root {
      --accent: #8abeb7;
      --border: #5f87ff;
      --borderAccent: #00d7ff;
      --borderMuted: #505050;
      --success: #b5bd68;
      --error: #cc6666;
      --warning: #ffff00;
      --muted: #808080;
      --dim: #666666;
      --text: #d4d4d4;
      --thinkingText: #808080;
      --selectedBg: #3a3a4a;
      --userMessageBg: #343541;
      --userMessageText: #d4d4d4;
      --customMessageBg: #2d2838;
      --customMessageText: #d4d4d4;
      --customMessageLabel: #9575cd;
      --toolPendingBg: #282832;
      --toolSuccessBg: #283228;
      --toolErrorBg: #3c2828;
      --toolTitle: #d4d4d4;
      --toolOutput: #808080;
      --mdHeading: #f0c674;
      --mdLink: #81a2be;
      --mdLinkUrl: #666666;
      --mdCode: #8abeb7;
      --mdCodeBlock: #b5bd68;
      --mdCodeBlockBorder: #808080;
      --mdQuote: #808080;
      --mdQuoteBorder: #808080;
      --mdHr: #808080;
      --mdListBullet: #8abeb7;
      --toolDiffAdded: #b5bd68;
      --toolDiffRemoved: #cc6666;
      --toolDiffContext: #808080;
      --syntaxComment: #6A9955;
      --syntaxKeyword: #569CD6;
      --syntaxFunction: #DCDCAA;
      --syntaxVariable: #9CDCFE;
      --syntaxString: #CE9178;
      --syntaxNumber: #B5CEA8;
      --syntaxType: #4EC9B0;
      --syntaxOperator: #D4D4D4;
      --syntaxPunctuation: #D4D4D4;
      --thinkingOff: #505050;
      --thinkingMinimal: #6e6e6e;
      --thinkingLow: #5f87af;
      --thinkingMedium: #81a2be;
      --thinkingHigh: #b294bb;
      --thinkingXhigh: #d183e8;
      --bashMode: #b5bd68;
      --exportPageBg: #18181e;
      --exportCardBg: #1e1e24;
      --exportInfoBg: #3c3728;
      --body-bg: #18181e;
      --container-bg: #1e1e24;
      --info-bg: #3c3728;
    }

    * { margin: 0; padding: 0; box-sizing: border-box; }

    :root {
      --line-height: 18px; /* 12px font * 1.5 */
      --sidebar-width: 400px;
      --sidebar-min-width: 240px;
      --sidebar-max-width: 840px;
      --sidebar-resizer-width: 6px;
    }

    body {
      font-family: ui-monospace, 'Cascadia Code', 'Source Code Pro', Menlo, Consolas, 'DejaVu Sans Mono', monospace;
      font-size: 12px;
      line-height: var(--line-height);
      color: var(--text);
      background: var(--body-bg);
    }

    body.sidebar-resizing {
      cursor: col-resize;
      user-select: none;
    }

    #app {
      display: flex;
      min-height: 100vh;
    }

    /* Sidebar */
    #sidebar {
      width: var(--sidebar-width);
      min-width: var(--sidebar-width);
      max-width: var(--sidebar-width);
      background: var(--container-bg);
      flex-shrink: 0;
      display: flex;
      flex-direction: column;
      position: sticky;
      top: 0;
      height: 100vh;
      border-right: 1px solid var(--dim);
    }

    #sidebar-resizer {
      width: var(--sidebar-resizer-width);
      flex-shrink: 0;
      position: sticky;
      top: 0;
      height: 100vh;
      cursor: col-resize;
      touch-action: none;
      background: transparent;
      border-right: 1px solid transparent;
    }

    #sidebar-resizer:hover,
    body.sidebar-resizing #sidebar-resizer {
      background: var(--selectedBg);
      border-right-color: var(--dim);
    }

    .sidebar-header {
      padding: 8px 12px;
      flex-shrink: 0;
    }

    .sidebar-controls {
      padding: 8px 8px 4px 8px;
    }

    .sidebar-search {
      width: 100%;
      box-sizing: border-box;
      padding: 4px 8px;
      font-size: 11px;
      font-family: inherit;
      background: var(--body-bg);
      color: var(--text);
      border: 1px solid var(--dim);
      border-radius: 3px;
    }

    .sidebar-filters {
      display: flex;
      padding: 4px 8px 8px 8px;
      gap: 4px;
      align-items: center;
      flex-wrap: wrap;
    }

    .sidebar-search:focus {
      outline: none;
      border-color: var(--accent);
    }

    .sidebar-search::placeholder {
      color: var(--muted);
    }

    .filter-btn {
      padding: 3px 8px;
      font-size: 10px;
      font-family: inherit;
      background: transparent;
      color: var(--muted);
      border: 1px solid var(--dim);
      border-radius: 3px;
      cursor: pointer;
    }

    .filter-btn:hover {
      color: var(--text);
      border-color: var(--text);
    }

    .filter-btn.active {
      background: var(--accent);
      color: var(--body-bg);
      border-color: var(--accent);
    }

    .sidebar-close {
      display: none;
      padding: 3px 8px;
      font-size: 12px;
      font-family: inherit;
      background: transparent;
      color: var(--muted);
      border: 1px solid var(--dim);
      border-radius: 3px;
      cursor: pointer;
      margin-left: auto;
    }

    .sidebar-close:hover {
      color: var(--text);
      border-color: var(--text);
    }

    .tree-container {
      flex: 1;
      overflow: auto;
      padding: 4px 0;
    }

    .tree-node {
      padding: 0 8px;
      cursor: pointer;
      display: flex;
      align-items: baseline;
      font-size: 11px;
      line-height: 13px;
      white-space: nowrap;
    }

    .tree-node:hover {
      background: var(--selectedBg);
    }

    .tree-node.active {
      background: var(--selectedBg);
    }

    .tree-node.active .tree-content {
      font-weight: bold;
    }

    .tree-node.in-path {
      background: color-mix(in srgb, var(--accent) 10%, transparent);
    }

    .tree-node:not(.in-path) {
      opacity: 0.5;
    }

    .tree-node:not(.in-path):hover {
      opacity: 1;
    }

    .tree-prefix {
      color: var(--muted);
      flex-shrink: 0;
      font-family: monospace;
      white-space: pre;
    }

    .tree-marker {
      color: var(--accent);
      flex-shrink: 0;
    }

    .tree-content {
      color: var(--text);
    }

    .tree-role-user {
      color: var(--accent);
    }

    .tree-role-skill {
      color: var(--customMessageLabel);
    }

    .tree-role-assistant {
      color: var(--success);
    }

    .tree-role-tool {
      color: var(--muted);
    }

    .tree-muted {
      color: var(--muted);
    }

    .tree-error {
      color: var(--error);
    }

    .tree-compaction {
      color: var(--borderAccent);
    }

    .tree-branch-summary {
      color: var(--warning);
    }

    .tree-custom-message {
      color: var(--customMessageLabel);
    }

    .tree-status {
      padding: 4px 12px;
      font-size: 10px;
      color: var(--muted);
      flex-shrink: 0;
    }

    /* Main content */
    #content {
      flex: 1;
      min-width: 0;
      overflow-y: auto;
      padding: var(--line-height) calc(var(--line-height) * 2);
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    #content > * {
      width: 100%;
      max-width: 800px;
    }

    /* Help bar */
    .help-bar {
      font-size: 11px;
      color: var(--warning);
      margin-bottom: var(--line-height);
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 12px;
    }

    .help-hint {
      flex: 1 1 240px;
    }

    .help-actions {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 8px;
    }

    .header-toggle-btn,
    .download-json-btn {
      font-size: 10px;
      padding: 2px 8px;
      background: var(--container-bg);
      border: 1px solid var(--border);
      border-radius: 3px;
      color: var(--text);
      cursor: pointer;
      font-family: inherit;
    }

    .header-toggle-btn:hover,
    .download-json-btn:hover {
      background: var(--hover);
      border-color: var(--borderAccent);
    }

    /* Header */
    .header {
      background: var(--container-bg);
      border-radius: 4px;
      padding: var(--line-height);
      margin-bottom: var(--line-height);
    }

    .header h1 {
      font-size: 12px;
      font-weight: bold;
      color: var(--borderAccent);
      margin-bottom: var(--line-height);
    }

    .header-info {
      display: flex;
      flex-direction: column;
      gap: 0;
      font-size: 11px;
    }

    .info-item {
      color: var(--dim);
      display: flex;
      align-items: baseline;
    }

    .info-label {
      font-weight: 600;
      margin-right: 8px;
      min-width: 100px;
    }

    .info-value {
      color: var(--text);
      flex: 1;
    }

    /* Messages */
    #messages {
      display: flex;
      flex-direction: column;
      gap: var(--line-height);
    }

    .message-timestamp {
      font-size: 10px;
      color: var(--dim);
      opacity: 0.8;
    }

    .user-message {
      background: var(--userMessageBg);
      color: var(--userMessageText);
      padding: var(--line-height);
      border-radius: 4px;
      position: relative;
    }

    .assistant-message {
      padding: 0;
      position: relative;
    }

    /* Copy link button - appears on hover */
    .copy-link-btn {
      position: absolute;
      top: 8px;
      right: 8px;
      width: 28px;
      height: 28px;
      padding: 6px;
      background: var(--container-bg);
      border: 1px solid var(--dim);
      border-radius: 4px;
      color: var(--muted);
      cursor: pointer;
      opacity: 0;
      transition: opacity 0.15s, background 0.15s, color 0.15s;
      display: flex;
      align-items: center;
      justify-content: center;
      z-index: 10;
    }

    .user-message:hover .copy-link-btn,
    .assistant-message:hover .copy-link-btn,
    .skill-user-entry:hover .copy-link-btn {
      opacity: 1;
    }

    .copy-link-btn:hover {
      background: var(--accent);
      color: var(--body-bg);
      border-color: var(--accent);
    }

    .copy-link-btn.copied {
      background: var(--success, #22c55e);
      color: white;
      border-color: var(--success, #22c55e);
    }

    /* Highlight effect for deep-linked messages */
    .user-message.highlight,
    .assistant-message.highlight {
      animation: highlight-pulse 2s ease-out;
    }

    @keyframes highlight-pulse {
      0% {
        box-shadow: 0 0 0 3px var(--accent);
      }
      100% {
        box-shadow: 0 0 0 0 transparent;
      }
    }

    .assistant-message > .message-timestamp {
      padding-left: var(--line-height);
    }

    .assistant-text {
      padding: var(--line-height);
      padding-bottom: 0;
    }

    .message-timestamp + .assistant-text,
    .message-timestamp + .thinking-block {
      padding-top: 0;
    }

    .thinking-block + .assistant-text {
      padding-top: 0;
    }

    .thinking-text {
      padding: var(--line-height);
      color: var(--thinkingText);
      font-style: italic;
      white-space: pre-wrap;
    }

    .message-timestamp + .thinking-block .thinking-text,
    .message-timestamp + .thinking-block .thinking-collapsed {
      padding-top: 0;
    }

    .thinking-collapsed {
      display: none;
      padding: var(--line-height);
      color: var(--thinkingText);
      font-style: italic;
    }

    /* Tool execution */
    .tool-execution {
      padding: var(--line-height);
      border-radius: 4px;
    }

    .tool-execution + .tool-execution {
      margin-top: var(--line-height);
    }

    .assistant-text + .tool-execution {
      margin-top: var(--line-height);
    }

    .tool-execution.pending { background: var(--toolPendingBg); }
    .tool-execution.success { background: var(--toolSuccessBg); }
    .tool-execution.error { background: var(--toolErrorBg); }

    .tool-header, .tool-name {
      font-weight: bold;
    }

    .tool-path {
      color: var(--accent);
      word-break: break-all;
    }

    .line-numbers {
      color: var(--warning);
    }

    .line-count {
      color: var(--dim);
    }

    .tool-command {
      font-weight: bold;
      white-space: pre-wrap;
      word-wrap: break-word;
      overflow-wrap: break-word;
      word-break: break-word;
    }

    .tool-output {
      margin-top: var(--line-height);
      color: var(--toolOutput);
      word-wrap: break-word;
      overflow-wrap: break-word;
      word-break: break-word;
      font-family: inherit;
      overflow-x: auto;
    }

    .tool-output > div,
    .output-preview > div,
    .output-full > div {
      margin: 0;
      padding: 0;
      line-height: var(--line-height);
    }

    .tool-output > div:not(.output-preview):not(.output-full),
    .output-preview > div:not(.expand-hint),
    .output-full > div:not(.expand-hint) {
      white-space: pre-wrap;
    }

    .tool-output pre {
      margin: 0;
      padding: 0;
      font-family: inherit;
      color: inherit;
      white-space: pre-wrap;
      word-wrap: break-word;
      overflow-wrap: break-word;
    }

    .tool-output code {
      padding: 0;
      background: none;
      color: var(--text);
    }

    .tool-output.expandable {
      cursor: pointer;
    }

    .tool-output.expandable:hover {
      opacity: 0.9;
    }

    .tool-output.expandable .output-full {
      display: none;
    }

    .tool-output.expandable.expanded .output-preview {
      display: none;
    }

    .tool-output.expandable.expanded .output-full {
      display: block;
    }

    .ansi-line {
      white-space: pre;
    }

    .tool-images {
    }

    .tool-image {
      max-width: 100%;
      max-height: 500px;
      border-radius: 4px;
      margin: var(--line-height) 0;
    }

    .expand-hint {
      color: var(--toolOutput);
    }

    /* Diff */
    .tool-diff {
      font-size: 11px;
      overflow-x: auto;
      white-space: pre;
    }

    .diff-added { color: var(--toolDiffAdded); }
    .diff-removed { color: var(--toolDiffRemoved); }
    .diff-context { color: var(--toolDiffContext); }

    /* Model change */
    .model-change {
      padding: 0 var(--line-height);
      color: var(--dim);
      font-size: 11px;
    }

    .model-name {
      color: var(--borderAccent);
      font-weight: bold;
    }

    /* Compaction / Branch Summary - matches customMessage colors from TUI */
    .compaction {
      background: var(--customMessageBg);
      border-radius: 4px;
      padding: var(--line-height);
      cursor: pointer;
    }

    .compaction-label {
      color: var(--customMessageLabel);
      font-weight: bold;
    }

    .compaction-collapsed {
      color: var(--customMessageText);
    }

    .compaction-content {
      display: none;
      color: var(--customMessageText);
      white-space: pre-wrap;
      margin-top: var(--line-height);
    }

    .compaction.expanded .compaction-collapsed {
      display: none;
    }

    .compaction.expanded .compaction-content {
      display: block;
    }

    /* System prompt */
    .system-prompt {
      background: var(--customMessageBg);
      padding: var(--line-height);
      border-radius: 4px;
      margin-bottom: var(--line-height);
    }

    .system-prompt.expandable {
      cursor: pointer;
    }

    .system-prompt-header {
      font-weight: bold;
      color: var(--customMessageLabel);
    }

    .system-prompt-preview {
      color: var(--customMessageText);
      white-space: pre-wrap;
      word-wrap: break-word;
      font-size: 11px;
      margin-top: var(--line-height);
    }

    .system-prompt-expand-hint {
      color: var(--muted);
      font-style: italic;
      margin-top: 4px;
    }

    .system-prompt-full {
      display: none;
      color: var(--customMessageText);
      white-space: pre-wrap;
      word-wrap: break-word;
      font-size: 11px;
      margin-top: var(--line-height);
    }

    .system-prompt.expanded .system-prompt-preview,
    .system-prompt.expanded .system-prompt-expand-hint {
      display: none;
    }

    .system-prompt.expanded .system-prompt-full {
      display: block;
    }

    .system-prompt.provider-prompt {
      border-left: 3px solid var(--warning);
    }

    .system-prompt-note {
      font-size: 10px;
      font-style: italic;
      color: var(--muted);
      margin-top: 4px;
    }

    /* Tools list */
    .tools-list {
      background: var(--customMessageBg);
      padding: var(--line-height);
      border-radius: 4px;
      margin-bottom: var(--line-height);
    }

    .tools-header {
      font-weight: bold;
      color: var(--customMessageLabel);
      margin-bottom: var(--line-height);
    }

    .tool-item {
      font-size: 11px;
    }

    .tool-item-name {
      font-weight: bold;
      color: var(--text);
    }

    .tool-item-desc {
      color: var(--dim);
    }

    .tool-params-hint {
      color: var(--muted);
      font-style: italic;
    }

    .tool-item:has(.tool-params-hint) {
      cursor: pointer;
    }

    .tool-params-hint::after {
      content: '[click to show parameters]';
    }

    .tool-item.params-expanded .tool-params-hint::after {
      content: '[hide parameters]';
    }

    .tool-params-content {
      display: none;
      margin-top: 4px;
      margin-left: 12px;
      padding-left: 8px;
      border-left: 1px solid var(--dim);
    }

    .tool-item.params-expanded .tool-params-content {
      display: block;
    }

    .tool-param {
      margin-bottom: 4px;
      font-size: 11px;
    }

    .tool-param-name {
      font-weight: bold;
      color: var(--text);
    }

    .tool-param-type {
      color: var(--dim);
      font-style: italic;
    }

    .tool-param-required {
      color: var(--warning, #e8a838);
      font-size: 10px;
    }

    .tool-param-optional {
      color: var(--dim);
      font-size: 10px;
    }

    .tool-param-desc {
      color: var(--dim);
      margin-left: 8px;
    }

    /* Hook/custom messages */
    .hook-message {
      background: var(--customMessageBg);
      color: var(--customMessageText);
      padding: var(--line-height);
      border-radius: 4px;
    }

    .hook-type {
      color: var(--customMessageLabel);
      font-weight: bold;
    }

    /* Skill invocation - matches compaction style (clickable, collapsed by default) */
    .skill-invocation {
      background: var(--customMessageBg);
      border-radius: 4px;
      padding: var(--line-height);
      cursor: pointer;
    }

    .skill-invocation-label {
      color: var(--customMessageLabel);
      font-weight: bold;
    }

    .skill-invocation-collapsed {
      color: var(--customMessageText);
    }

    .skill-invocation-content {
      display: none;
      color: var(--customMessageText);
      margin-top: var(--line-height);
    }

    .skill-invocation.expanded .skill-invocation-collapsed {
      display: none;
    }

    .skill-invocation.expanded .skill-invocation-content {
      display: block;
    }

    .skill-invocation + .user-message {
      margin-top: var(--line-height);
    }

    .skill-user-entry {
      position: relative;
    }

    /* Branch summary */
    .branch-summary {
      background: var(--customMessageBg);
      padding: var(--line-height);
      border-radius: 4px;
    }

    .branch-summary-header {
      font-weight: bold;
      color: var(--borderAccent);
    }

    /* Error */
    .error-text {
      color: var(--error);
      padding: 0 var(--line-height);
    }
    .tool-error {
      color: var(--error);
    }

    /* Images */
    .message-images {
      margin-bottom: 12px;
    }

    .message-image {
      max-width: 100%;
      max-height: 400px;
      border-radius: 4px;
      margin: var(--line-height) 0;
    }

    /* Markdown content */
    .markdown-content h1,
    .markdown-content h2,
    .markdown-content h3,
    .markdown-content h4,
    .markdown-content h5,
    .markdown-content h6 {
      color: var(--mdHeading);
      margin: var(--line-height) 0 0 0;
      font-weight: bold;
    }

    .markdown-content h1 { font-size: 1em; }
    .markdown-content h2 { font-size: 1em; }
    .markdown-content h3 { font-size: 1em; }
    .markdown-content h4 { font-size: 1em; }
    .markdown-content h5 { font-size: 1em; }
    .markdown-content h6 { font-size: 1em; }
    .markdown-content p { margin: 0; }
    .markdown-content p + p { margin-top: var(--line-height); }

    .markdown-content a {
      color: var(--mdLink);
      text-decoration: underline;
    }

    .markdown-content code {
      background: rgba(128, 128, 128, 0.2);
      color: var(--mdCode);
      padding: 0 4px;
      border-radius: 3px;
      font-family: inherit;
    }

    .markdown-content pre {
      background: transparent;
      margin: var(--line-height) 0;
      overflow-x: auto;
    }

    .markdown-content pre code {
      display: block;
      background: none;
      color: var(--text);
    }

    .markdown-content blockquote {
      border-left: 3px solid var(--mdQuoteBorder);
      padding-left: var(--line-height);
      margin: var(--line-height) 0;
      color: var(--mdQuote);
      font-style: italic;
    }

    .markdown-content ul,
    .markdown-content ol {
      margin: var(--line-height) 0;
      padding-left: calc(var(--line-height) * 2);
    }

    .markdown-content li { margin: 0; }
    .markdown-content li::marker { color: var(--mdListBullet); }

    .markdown-content hr {
      border: none;
      border-top: 1px solid var(--mdHr);
      margin: var(--line-height) 0;
    }

    .markdown-content table {
      border-collapse: collapse;
      margin: 0.5em 0;
      width: 100%;
    }

    .markdown-content th,
    .markdown-content td {
      border: 1px solid var(--mdCodeBlockBorder);
      padding: 6px 10px;
      text-align: left;
    }

    .markdown-content th {
      background: rgba(128, 128, 128, 0.1);
      font-weight: bold;
    }

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      padding: 20px;
      text-align: center;
      color: var(--dim);
      font-size: 10px;
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      left: 10px;
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s.length>=r.length?e.slice(r.length):e})).join("\n")}(e,t[3]||"",this.rules);return{type:"code",raw:e,lang:t[2]?t[2].trim().replace(this.rules.inline.anyPunctuation,"$1"):t[2],text:n}}}heading(e){const t=this.rules.block.heading.exec(e);if(t){let e=t[2].trim();if(this.rules.other.endingHash.test(e)){const t=J(e,"#");this.options.pedantic?e=t.trim():t&&!this.rules.other.endingSpaceChar.test(t)||(e=t.trim())}return{type:"heading",raw:t[0],depth:t[1].length,text:e,tokens:this.lexer.inline(e)}}}hr(e){const t=this.rules.block.hr.exec(e);if(t)return{type:"hr",raw:J(t[0],"\n")}}blockquote(e){const t=this.rules.block.blockquote.exec(e);if(t){let e=J(t[0],"\n").split("\n"),n="",s="";const r=[];for(;e.length>0;){let t=!1;const i=[];let l;for(l=0;l<e.length;l++)if(this.rules.other.blockquoteStart.test(e[l]))i.push(e[l]),t=!0;else{if(t)break;i.push(e[l])}e=e.slice(l);const o=i.join("\n"),a=o.replace(this.rules.other.blockquoteSetextReplace,"\n    $1").replace(this.rules.other.blockquoteSetextReplace2,"");n=n?`${n}\n${o}`:o,s=s?`${s}\n${a}`:a;const c=this.lexer.state.top;if(this.lexer.state.top=!0,this.lexer.blockTokens(a,r,!0),this.lexer.state.top=c,0===e.length)break;const h=r.at(-1);if("code"===h?.type)break;if("blockquote"===h?.type){const t=h,i=t.raw+"\n"+e.join("\n"),l=this.blockquote(i);r[r.length-1]=l,n=n.substring(0,n.length-t.raw.length)+l.raw,s=s.substring(0,s.length-t.text.length)+l.text;break}if("list"!==h?.type);else{const t=h,i=t.raw+"\n"+e.join("\n"),l=this.list(i);r[r.length-1]=l,n=n.substring(0,n.length-h.raw.length)+l.raw,s=s.substring(0,s.length-t.raw.length)+l.raw,e=i.substring(r.at(-1).raw.length).split("\n")}}return{type:"blockquote",raw:n,tokens:r,text:s}}}list(e){let t=this.rules.block.list.exec(e);if(t){let n=t[1].trim();const s=n.length>1,r={type:"list",raw:"",ordered:s,start:s?+n.slice(0,-1):"",loose:!1,items:[]};n=s?`\\d{1,9}\\${n.slice(-1)}`:`\\${n}`,this.options.pedantic&&(n=s?n:"[*+-]");const i=this.rules.other.listItemRegex(n);let l=!1;for(;e;){let n=!1,s="",o="";if(!(t=i.exec(e)))break;if(this.rules.block.hr.test(e))break;s=t[0],e=e.substring(s.length);let a=t[2].split("\n",1)[0].replace(this.rules.other.listReplaceTabs,(e=>" ".repeat(3*e.length))),c=e.split("\n",1)[0],h=!a.trim(),p=0;if(this.options.pedantic?(p=2,o=a.trimStart()):h?p=t[1].length+1:(p=t[2].search(this.rules.other.nonSpaceChar),p=p>4?1:p,o=a.slice(p),p+=t[1].length),h&&this.rules.other.blankLine.test(c)&&(s+=c+"\n",e=e.substring(c.length+1),n=!0),!n){const t=this.rules.other.nextBulletRegex(p),n=this.rules.other.hrRegex(p),r=this.rules.other.fencesBeginRegex(p),i=this.rules.other.headingBeginRegex(p),l=this.rules.other.htmlBeginRegex(p);for(;e;){const u=e.split("\n",1)[0];let g;if(c=u,this.options.pedantic?(c=c.replace(this.rules.other.listReplaceNesting,"  "),g=c):g=c.replace(this.rules.other.tabCharGlobal,"    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t=r.items[e].tokens.filter((e=>"space"===e.type)),n=t.length>0&&t.some((e=>this.rules.other.anyLine.test(e.raw)));r.loose=n}if(r.loose)for(let e=0;e<r.items.length;e++)r.items[e].loose=!0;return r}}html(e){const t=this.rules.block.html.exec(e);if(t){return{type:"html",block:!0,raw:t[0],pre:"pre"===t[1]||"script"===t[1]||"style"===t[1],text:t[0]}}}def(e){const t=this.rules.block.def.exec(e);if(t){const e=t[1].toLowerCase().replace(this.rules.other.multipleSpaceGlobal," "),n=t[2]?t[2].replace(this.rules.other.hrefBrackets,"$1").replace(this.rules.inline.anyPunctuation,"$1"):"",s=t[3]?t[3].substring(1,t[3].length-1).replace(this.rules.inline.anyPunctuation,"$1"):t[3];return{type:"def",tag:e,raw:t[0],href:n,title:s}}}table(e){const t=this.rules.block.table.exec(e);if(!t)return;if(!this.rules.other.tableDelimiter.test(t[2]))return;const n=U(t[1]),s=t[2].replace(this.rules.other.tableAlignChars,"").split("|"),r=t[3]?.trim()?t[3].replace(this.rules.other.tableRowBlankLine,"").split("\n"):[],i={type:"table",raw:t[0],header:[],align:[],rows:[]};if(n.length===s.length){for(const e of s)this.rules.other.tableAlignRight.test(e)?i.align.push("right"):this.rules.other.tableAlignCenter.test(e)?i.align.push("center"):this.rules.other.tableAlignLeft.test(e)?i.align.push("left"):i.align.push(null);for(let e=0;e<n.length;e++)i.header.push({text:n[e],tokens:this.lexer.inline(n[e]),header:!0,align:i.align[e]});for(const e of r)i.rows.push(U(e,i.header.length).map(((e,t)=>({text:e,tokens:this.lexer.inline(e),header:!1,align:i.align[t]}))));return i}}lheading(e){const t=this.rules.block.lheading.exec(e);if(t)return{type:"heading",raw:t[0],depth:"="===t[2].charAt(0)?1:2,text:t[1],tokens:this.lexer.inline(t[1])}}paragraph(e){const t=this.rules.block.paragraph.exec(e);if(t){const e="\n"===t[1].charAt(t[1].length-1)?t[1].slice(0,-1):t[1];return{type:"paragraph",raw:t[0],text:e,tokens:this.lexer.inline(e)}}}text(e){const t=this.rules.block.text.exec(e);if(t)return{type:"text",raw:t[0],text:t[0],tokens:this.lexer.inline(t[0])}}escape(e){const t=this.rules.inline.escape.exec(e);if(t)return{type:"escape",raw:t[0],text:t[1]}}tag(e){const t=this.rules.inline.tag.exec(e);if(t)return!this.lexer.state.inLink&&this.rules.other.startATag.test(t[0])?this.lexer.state.inLink=!0:this.lexer.state.inLink&&this.rules.other.endATag.test(t[0])&&(this.lexer.state.inLink=!1),!this.lexer.state.inRawBlock&&this.rules.other.startPreScriptTag.test(t[0])?this.lexer.state.inRawBlock=!0:this.lexer.state.inRawBlock&&this.rules.other.endPreScriptTag.test(t[0])&&(this.lexer.state.inRawBlock=!1),{type:"html",raw:t[0],inLink:this.lexer.state.inLink,inRawBlock:this.lexer.state.inRawBlock,block:!1,text:t[0]}}link(e){const t=this.rules.inline.link.exec(e);if(t){const e=t[2].trim();if(!this.options.pedantic&&this.rules.other.startAngleBracket.test(e)){if(!this.rules.other.endAngleBracket.test(e))return;const t=J(e.slice(0,-1),"\\");if((e.length-t.length)%2==0)return}else{const e=function(e,t){if(-1===e.indexOf(t[1]))return-1;let n=0;for(let s=0;s<e.length;s++)if("\\"===e[s])s++;else if(e[s]===t[0])n++;else if(e[s]===t[1]&&(n--,n<0))return s;return-1}(t[2],"()");if(e>-1){const n=(0===t[0].indexOf("!")?5:4)+t[1].length+e;t[2]=t[2].substring(0,e),t[0]=t[0].substring(0,n).trim(),t[3]=""}}let n=t[2],s="";if(this.options.pedantic){const e=this.rules.other.pedanticHrefTitle.exec(n);e&&(n=e[1],s=e[3])}else s=t[3]?t[3].slice(1,-1):"";return n=n.trim(),this.rules.other.startAngleBracket.test(n)&&(n=this.options.pedantic&&!this.rules.other.endAngleBracket.test(e)?n.slice(1):n.slice(1,-1)),K(t,{href:n?n.replace(this.rules.inline.anyPunctuation,"$1"):n,title:s?s.replace(this.rules.inline.anyPunctuation,"$1"):s},t[0],this.lexer,this.rules)}}reflink(e,t){let n;if((n=this.rules.inline.reflink.exec(e))||(n=this.rules.inline.nolink.exec(e))){const e=t[(n[2]||n[1]).replace(this.rules.other.multipleSpaceGlobal," ").toLowerCase()];if(!e){const e=n[0].charAt(0);return{type:"text",raw:e,text:e}}return K(n,e,n[0],this.lexer,this.rules)}}emStrong(e,t,n=""){let s=this.rules.inline.emStrongLDelim.exec(e);if(!s)return;if(s[3]&&n.match(this.rules.other.unicodeAlphaNumeric))return;if(!(s[1]||s[2]||"")||!n||this.rules.inline.punctuation.exec(n)){const n=[...s[0]].length-1;let r,i,l=n,o=0;const a="*"===s[0][0]?this.rules.inline.emStrongRDelimAst:this.rules.inline.emStrongRDelimUnd;for(a.lastIndex=0,t=t.slice(-1*e.length+n);null!=(s=a.exec(t));){if(r=s[1]||s[2]||s[3]||s[4]||s[5]||s[6],!r)continue;if(i=[...r].length,s[3]||s[4]){l+=i;continue}if((s[5]||s[6])&&n%3&&!((n+i)%3)){o+=i;continue}if(l-=i,l>0)continue;i=Math.min(i,i+l+o);const t=[...s[0]][0].length,a=e.slice(0,n+s.index+t+i);if(Math.min(n,i)%2){const e=a.slice(1,-1);return{type:"em",raw:a,text:e,tokens:this.lexer.inlineTokens(e)}}const c=a.slice(2,-2);return{type:"strong",raw:a,text:c,tokens:this.lexer.inlineTokens(c)}}}}codespan(e){const t=this.rules.inline.code.exec(e);if(t){let e=t[2].replace(this.rules.other.newLineCharGlobal," ");const n=this.rules.other.nonSpaceChar.test(e),s=this.rules.other.startingSpaceChar.test(e)&&this.rules.other.endingSpaceChar.test(e);return n&&s&&(e=e.substring(1,e.length-1)),{type:"codespan",raw:t[0],text:e}}}br(e){const t=this.rules.inline.br.exec(e);if(t)return{type:"br",raw:t[0]}}del(e){const t=this.rules.inline.del.exec(e);if(t)return{type:"del",raw:t[0],text:t[2],tokens:this.lexer.inlineTokens(t[2])}}autolink(e){const t=this.rules.inline.autolink.exec(e);if(t){let e,n;return"@"===t[2]?(e=t[1],n="mailto:"+e):(e=t[1],n=e),{type:"link",raw:t[0],text:e,href:n,tokens:[{type:"text",raw:e,text:e}]}}}url(e){let t;if(t=this.rules.inline.url.exec(e)){let e,n;if("@"===t[2])e=t[0],n="mailto:"+e;else{let s;do{s=t[0],t[0]=this.rules.inline._backpedal.exec(t[0])?.[0]??""}while(s!==t[0]);e=t[0],n="www."===t[1]?"http://"+t[0]:t[0]}return{type:"link",raw:t[0],text:e,href:n,tokens:[{type:"text",raw:e,text:e}]}}}inlineText(e){const t=this.rules.inline.text.exec(e);if(t){const e=this.lexer.state.inRawBlock;return{type:"text",raw:t[0],text:t[0],escaped:e}}}}class W{tokens;options;state;tokenizer;inlineQueue;constructor(t){this.tokens=[],this.tokens.links=Object.create(null),this.options=t||e.defaults,this.options.tokenizer=this.options.tokenizer||new V,this.tokenizer=this.options.tokenizer,this.tokenizer.options=this.options,this.tokenizer.lexer=this,this.inlineQueue=[],this.state={inLink:!1,inRawBlock:!1,top:!0};const n={other:i,block:j.normal,inline:N.normal};this.options.pedantic?(n.block=j.pedantic,n.inline=N.pedantic):this.options.gfm&&(n.block=j.gfm,this.options.breaks?n.inline=N.breaks:n.inline=N.gfm),this.tokenizer.rules=n}static get rules(){return{block:j,inline:N}}static lex(e,t){return new W(t).lex(e)}static lexInline(e,t){return new W(t).inlineTokens(e)}lex(e){e=e.replace(i.carriageReturn,"\n"),this.blockTokens(e,this.tokens);for(let e=0;e<this.inlineQueue.length;e++){const t=this.inlineQueue[e];this.inlineTokens(t.src,t.tokens)}return this.inlineQueue=[],this.tokens}blockTokens(e,t=[],n=!1){for(this.options.pedantic&&(e=e.replace(i.tabCharGlobal,"    ").replace(i.spaceLine,""));e;){let s;if(this.options.extensions?.block?.some((n=>!!(s=n.call({lexer:this},e,t))&&(e=e.substring(s.raw.length),t.push(s),!0))))continue;if(s=this.tokenizer.space(e)){e=e.substring(s.raw.length);const n=t.at(-1);1===s.raw.length&&void 0!==n?n.raw+="\n":t.push(s);continue}if(s=this.tokenizer.code(e)){e=e.substring(s.raw.length);const n=t.at(-1);"paragraph"===n?.type||"text"===n?.type?(n.raw+="\n"+s.raw,n.text+="\n"+s.text,this.inlineQueue.at(-1).src=n.text):t.push(s);continue}if(s=this.tokenizer.fences(e)){e=e.substring(s.raw.length),t.push(s);continue}if(s=this.tokenizer.heading(e)){e=e.substring(s.raw.length),t.push(s);continue}if(s=this.tokenizer.hr(e)){e=e.substring(s.raw.length),t.push(s);continue}if(s=this.tokenizer.blockquote(e)){e=e.substring(s.raw.length),t.push(s);continue}if(s=this.tokenizer.list(e)){e=e.substring(s.raw.length),t.push(s);continue}if(s=this.tokenizer.html(e)){e=e.substring(s.raw.length),t.push(s);continue}if(s=this.tokenizer.def(e)){e=e.substring(s.raw.length);const n=t.at(-1);"paragraph"===n?.type||"text"===n?.type?(n.raw+="\n"+s.raw,n.text+="\n"+s.raw,this.inlineQueue.at(-1).src=n.text):this.tokens.links[s.tag]||(this.tokens.links[s.tag]={href:s.href,title:s.title});continue}if(s=this.tokenizer.table(e)){e=e.substring(s.raw.length),t.push(s);continue}if(s=this.tokenizer.lheading(e)){e=e.substring(s.raw.length),t.push(s);continue}let r=e;if(this.options.extensions?.startBlock){let t=1/0;const n=e.slice(1);let s;this.options.extensions.startBlock.forEach((e=>{s=e.call({lexer:this},n),"number"==typeof s&&s>=0&&(t=Math.min(t,s))})),t<1/0&&t>=0&&(r=e.substring(0,t+1))}if(this.state.top&&(s=this.tokenizer.paragraph(r))){const i=t.at(-1);n&&"paragraph"===i?.type?(i.raw+="\n"+s.raw,i.text+="\n"+s.text,this.inlineQueue.pop(),this.inlineQueue.at(-1).src=i.text):t.push(s),n=r.length!==e.length,e=e.substring(s.raw.length)}else if(s=this.tokenizer.text(e)){e=e.substring(s.raw.length);const n=t.at(-1);"text"===n?.type?(n.raw+="\n"+s.raw,n.text+="\n"+s.text,this.inlineQueue.pop(),this.inlineQueue.at(-1).src=n.text):t.push(s)}else if(e){const t="Infinite loop on byte: "+e.charCodeAt(0);if(this.options.silent){console.error(t);break}throw new Error(t)}}return this.state.top=!0,t}inline(e,t=[]){return this.inlineQueue.push({src:e,tokens:t}),t}inlineTokens(e,t=[]){let n=e,s=null;if(this.tokens.links){const e=Object.keys(this.tokens.links);if(e.length>0)for(;null!=(s=this.tokenizer.rules.inline.reflinkSearch.exec(n));)e.includes(s[0].slice(s[0].lastIndexOf("[")+1,-1))&&(n=n.slice(0,s.index)+"["+"a".repeat(s[0].length-2)+"]"+n.slice(this.tokenizer.rules.inline.reflinkSearch.lastIndex))}for(;null!=(s=this.tokenizer.rules.inline.blockSkip.exec(n));)n=n.slice(0,s.index)+"["+"a".repeat(s[0].length-2)+"]"+n.slice(this.tokenizer.rules.inline.blockSkip.lastIndex);for(;null!=(s=this.tokenizer.rules.inline.anyPunctuation.exec(n));)n=n.slice(0,s.index)+"++"+n.slice(this.tokenizer.rules.inline.anyPunctuation.lastIndex);let r=!1,i="";for(;e;){let 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        }
      }

      // Label lookup (entryId -> label string)
      // Labels are stored in 'label' entries that reference their target via targetId
      const labelMap = new Map();
      for (const entry of entries) {
        if (entry.type === 'label' && entry.targetId && entry.label) {
          labelMap.set(entry.targetId, entry.label);
        }
      }

      // ============================================================
      // TREE DATA PREPARATION (no DOM, pure data)
      // ============================================================

      /**
       * Build tree structure from flat entries.
       * Returns array of root nodes, each with { entry, children, label }.
       */
      function buildTree() {
        const nodeMap = new Map();
        const roots = [];

        // Create nodes
        for (const entry of entries) {
          nodeMap.set(entry.id, {
            entry,
            children: [],
            label: labelMap.get(entry.id)
          });
        }

        // Build parent-child relationships
        for (const entry of entries) {
          const node = nodeMap.get(entry.id);
          if (entry.parentId === null || entry.parentId === undefined || entry.parentId === entry.id) {
            roots.push(node);
          } else {
            const parent = nodeMap.get(entry.parentId);
            if (parent) {
              parent.children.push(node);
            } else {
              roots.push(node);
            }
          }
        }

        // Sort children by timestamp
        function sortChildren(node) {
          node.children.sort((a, b) =>
            new Date(a.entry.timestamp).getTime() - new Date(b.entry.timestamp).getTime()
          );
          node.children.forEach(sortChildren);
        }
        roots.forEach(sortChildren);

        return roots;
      }

      /**
       * Build set of entry IDs on path from root to target.
       */
      function buildActivePathIds(targetId) {
        const ids = new Set();
        let current = byId.get(targetId);
        while (current) {
          ids.add(current.id);
          // Stop if no parent or self-referencing (root)
          if (!current.parentId || current.parentId === current.id) {
            break;
          }
          current = byId.get(current.parentId);
        }
        return ids;
      }

      /**
       * Get array of entries from root to target (the conversation path).
       */
      function getPath(targetId) {
        const path = [];
        let current = byId.get(targetId);
        while (current) {
          path.unshift(current);
          // Stop if no parent or self-referencing (root)
          if (!current.parentId || current.parentId === current.id) {
            break;
          }
          current = byId.get(current.parentId);
        }
        return path;
      }

      // Tree node lookup for finding leaves
      let treeNodeMap = null;

      /**
       * Find the newest leaf node reachable from a given node.
       * This allows clicking any node in a branch to show the full branch.
       * Children are sorted by timestamp, so the newest is always last.
       */
      function findNewestLeaf(nodeId) {
        // Build tree node map lazily
        if (!treeNodeMap) {
          treeNodeMap = new Map();
          const tree = buildTree();
          function mapNodes(node) {
            treeNodeMap.set(node.entry.id, node);
            node.children.forEach(mapNodes);
          }
          tree.forEach(mapNodes);
        }

        const node = treeNodeMap.get(nodeId);
        if (!node) return nodeId;

        // Follow the newest (last) child at each level
        let current = node;
        while (current.children.length > 0) {
          current = current.children[current.children.length - 1];
        }
        return current.entry.id;
      }

      /**
       * Flatten tree into list with indentation and connector info.
       * Returns array of { node, indent, showConnector, isLast, gutters, isVirtualRootChild, multipleRoots }.
       * Matches tree-selector.ts logic exactly.
       */
      function flattenTree(roots, activePathIds) {
        const result = [];
        const multipleRoots = roots.length > 1;

        // Mark which subtrees contain the active leaf
        const containsActive = new Map();
        function markActive(node) {
          let has = activePathIds.has(node.entry.id);
          for (const child of node.children) {
            if (markActive(child)) has = true;
          }
          containsActive.set(node, has);
          return has;
        }
        roots.forEach(markActive);

        // Stack: [node, indent, justBranched, showConnector, isLast, gutters, isVirtualRootChild]
        const stack = [];

        // Add roots (prioritize branch containing active leaf)
        const orderedRoots = [...roots].sort((a, b) =>
          Number(containsActive.get(b)) - Number(containsActive.get(a))
        );
        for (let i = orderedRoots.length - 1; i >= 0; i--) {
          const isLast = i === orderedRoots.length - 1;
          stack.push([orderedRoots[i], multipleRoots ? 1 : 0, multipleRoots, multipleRoots, isLast, [], multipleRoots]);
        }

        while (stack.length > 0) {
          const [node, indent, justBranched, showConnector, isLast, gutters, isVirtualRootChild] = stack.pop();

          result.push({ node, indent, showConnector, isLast, gutters, isVirtualRootChild, multipleRoots });

          const children = node.children;
          const multipleChildren = children.length > 1;

          // Order children (active branch first)
          const orderedChildren = [...children].sort((a, b) =>
            Number(containsActive.get(b)) - Number(containsActive.get(a))
          );

          // Calculate child indent (matches tree-selector.ts)
          let childIndent;
          if (multipleChildren) {
            // Parent branches: children get +1
            childIndent = indent + 1;
          } else if (justBranched && indent > 0) {
            // First generation after a branch: +1 for visual grouping
            childIndent = indent + 1;
          } else {
            // Single-child chain: stay flat
            childIndent = indent;
          }

          // Build gutters for children
          const connectorDisplayed = showConnector && !isVirtualRootChild;
          const currentDisplayIndent = multipleRoots ? Math.max(0, indent - 1) : indent;
          const connectorPosition = Math.max(0, currentDisplayIndent - 1);
          const childGutters = connectorDisplayed
            ? [...gutters, { position: connectorPosition, show: !isLast }]
            : gutters;

          // Add children in reverse order for stack
          for (let i = orderedChildren.length - 1; i >= 0; i--) {
            const childIsLast = i === orderedChildren.length - 1;
            stack.push([orderedChildren[i], childIndent, multipleChildren, multipleChildren, childIsLast, childGutters, false]);
          }
        }

        return result;
      }

      /**
       * Build ASCII prefix string for tree node.
       */
      function buildTreePrefix(flatNode) {
        const { indent, showConnector, isLast, gutters, isVirtualRootChild, multipleRoots } = flatNode;
        const displayIndent = multipleRoots ? Math.max(0, indent - 1) : indent;
        const connector = showConnector && !isVirtualRootChild ? (isLast ? '└─ ' : '├─ ') : '';
        const connectorPosition = connector ? displayIndent - 1 : -1;

        const totalChars = displayIndent * 3;
        const prefixChars = [];
        for (let i = 0; i < totalChars; i++) {
          const level = Math.floor(i / 3);
          const posInLevel = i % 3;

          const gutter = gutters.find(g => g.position === level);
          if (gutter) {
            prefixChars.push(posInLevel === 0 ? (gutter.show ? '│' : ' ') : ' ');
          } else if (connector && level === connectorPosition) {
            if (posInLevel === 0) {
              prefixChars.push(isLast ? '└' : '├');
            } else if (posInLevel === 1) {
              prefixChars.push('─');
            } else {
              prefixChars.push(' ');
            }
          } else {
            prefixChars.push(' ');
          }
        }
        return prefixChars.join('');
      }

      // ============================================================
      // FILTERING (pure data)
      // ============================================================

      let filterMode = 'default';
      let searchQuery = '';

      function hasTextContent(content) {
        if (typeof content === 'string') return content.trim().length > 0;
        if (Array.isArray(content)) {
          for (const c of content) {
            if (c.type === 'text' && c.text && c.text.trim().length > 0) return true;
          }
        }
        return false;
      }

      function extractContent(content) {
        if (typeof content === 'string') return content;
        if (Array.isArray(content)) {
          return content
            .filter(c => c.type === 'text' && c.text)
            .map(c => c.text)
            .join('');
        }
        return '';
      }

      /**
       * Parse a skill block from message text.
       * Returns null if the text doesn't contain a skill block.
       * Matches the format: <skill name="..." location="...">\n...\n</skill>\n\nuser message
       */
      function parseSkillBlock(text) {
        const match = text.match(/^<skill name="([^"]+)" location="([^"]+)">\n([\s\S]*?)\n<\/skill>(?:\n\n([\s\S]+))?$/);
        if (!match) return null;
        return {
          name: match[1],
          location: match[2],
          content: match[3],
          userMessage: match[4]?.trim() || undefined,
        };
      }

      function getSearchableText(entry, label) {
        const parts = [];
        if (label) parts.push(label);

        switch (entry.type) {
          case 'message': {
            const msg = entry.message;
            parts.push(msg.role);
            if (msg.content) parts.push(extractContent(msg.content));
            if (msg.role === 'bashExecution' && msg.command) parts.push(msg.command);
            break;
          }
          case 'custom_message':
            parts.push(entry.customType);
            parts.push(typeof entry.content === 'string' ? entry.content : extractContent(entry.content));
            break;
          case 'compaction':
            parts.push('compaction');
            break;
          case 'branch_summary':
            parts.push('branch summary', entry.summary);
            break;
          case 'model_change':
            parts.push('model', entry.modelId);
            break;
          case 'thinking_level_change':
            parts.push('thinking', entry.thinkingLevel);
            break;
        }

        return parts.join(' ').toLowerCase();
      }

      /**
       * Filter flat nodes based on current filterMode and searchQuery.
       */
      function filterNodes(flatNodes, currentLeafId) {
        const searchTokens = searchQuery.toLowerCase().split(/\s+/).filter(Boolean);

        const filtered = flatNodes.filter(flatNode => {
          const entry = flatNode.node.entry;
          const label = flatNode.node.label;
          const isCurrentLeaf = entry.id === currentLeafId;

          // Always show current leaf
          if (isCurrentLeaf) return true;

          // Hide assistant messages with only tool calls (no text) unless error/aborted
          if (entry.type === 'message' && entry.message.role === 'assistant') {
            const msg = entry.message;
            const hasText = hasTextContent(msg.content);
            const isErrorOrAborted = msg.stopReason && msg.stopReason !== 'stop' && msg.stopReason !== 'toolUse';
            if (!hasText && !isErrorOrAborted) return false;
          }

          // Apply filter mode
          const isSettingsEntry = ['label', 'custom', 'model_change', 'thinking_level_change'].includes(entry.type);
          let passesFilter = true;

          switch (filterMode) {
            case 'user-only':
              passesFilter = entry.type === 'message' && entry.message.role === 'user';
              break;
            case 'no-tools':
              passesFilter = !isSettingsEntry && !(entry.type === 'message' && entry.message.role === 'toolResult');
              break;
            case 'labeled-only':
              passesFilter = label !== undefined;
              break;
            case 'all':
              passesFilter = true;
              break;
            default: // 'default'
              passesFilter = !isSettingsEntry;
              break;
          }

          if (!passesFilter) return false;

          // Apply search filter
          if (searchTokens.length > 0) {
            const nodeText = getSearchableText(entry, label);
            if (!searchTokens.every(t => nodeText.includes(t))) return false;
          }

          return true;
        });

        // Recalculate visual structure based on visible tree
        recalculateVisualStructure(filtered, flatNodes);

        return filtered;
      }

      /**
       * Recompute indentation/connectors for the filtered view
       *
       * Filtering can hide intermediate entries; descendants attach to the nearest visible ancestor.
       * Keep indentation semantics aligned with flattenTree() so single-child chains don't drift right.
       */
      function recalculateVisualStructure(filteredNodes, allFlatNodes) {
        if (filteredNodes.length === 0) return;

        const visibleIds = new Set(filteredNodes.map(n => n.node.entry.id));

        // Build entry map for parent lookup (using full tree)
        const entryMap = new Map();
        for (const flatNode of allFlatNodes) {
          entryMap.set(flatNode.node.entry.id, flatNode);
        }

        // Find nearest visible ancestor for a node
        function findVisibleAncestor(nodeId) {
          let currentId = entryMap.get(nodeId)?.node.entry.parentId;
          while (currentId != null) {
            if (visibleIds.has(currentId)) {
              return currentId;
            }
            currentId = entryMap.get(currentId)?.node.entry.parentId;
          }
          return null;
        }

        // Build visible tree structure
        const visibleParent = new Map();
        const visibleChildren = new Map();
        visibleChildren.set(null, []); // root-level nodes

        for (const flatNode of filteredNodes) {
          const nodeId = flatNode.node.entry.id;
          const ancestorId = findVisibleAncestor(nodeId);
          visibleParent.set(nodeId, ancestorId);

          if (!visibleChildren.has(ancestorId)) {
            visibleChildren.set(ancestorId, []);
          }
          visibleChildren.get(ancestorId).push(nodeId);
        }

        // Update multipleRoots based on visible roots
        const visibleRootIds = visibleChildren.get(null);
        const multipleRoots = visibleRootIds.length > 1;

        // Build a map for quick lookup: nodeId → FlatNode
        const filteredNodeMap = new Map();
        for (const flatNode of filteredNodes) {
          filteredNodeMap.set(flatNode.node.entry.id, flatNode);
        }

        // DFS traversal of visible tree, applying same indentation rules as flattenTree()
        // Stack items: [nodeId, indent, justBranched, showConnector, isLast, gutters, isVirtualRootChild]
        const stack = [];

        // Add visible roots in reverse order (to process in forward order via stack)
        for (let i = visibleRootIds.length - 1; i >= 0; i--) {
          const isLast = i === visibleRootIds.length - 1;
          stack.push([
            visibleRootIds[i],
            multipleRoots ? 1 : 0,
            multipleRoots,
            multipleRoots,
            isLast,
            [],
            multipleRoots
          ]);
        }

        while (stack.length > 0) {
          const [nodeId, indent, justBranched, showConnector, isLast, gutters, isVirtualRootChild] = stack.pop();

          const flatNode = filteredNodeMap.get(nodeId);
          if (!flatNode) continue;

          // Update this node's visual properties
          flatNode.indent = indent;
          flatNode.showConnector = showConnector;
          flatNode.isLast = isLast;
          flatNode.gutters = gutters;
          flatNode.isVirtualRootChild = isVirtualRootChild;
          flatNode.multipleRoots = multipleRoots;

          // Get visible children of this node
          const children = visibleChildren.get(nodeId) || [];
          const multipleChildren = children.length > 1;

          // Calculate child indent using same rules as flattenTree():
          // - Parent branches (multiple children): children get +1
          // - Just branched and indent > 0: children get +1 for visual grouping
          // - Single-child chain: stay flat
          let childIndent;
          if (multipleChildren) {
            childIndent = indent + 1;
          } else if (justBranched && indent > 0) {
            childIndent = indent + 1;
          } else {
            childIndent = indent;
          }

          // Build gutters for children (same logic as flattenTree)
          const connectorDisplayed = showConnector && !isVirtualRootChild;
          const currentDisplayIndent = multipleRoots ? Math.max(0, indent - 1) : indent;
          const connectorPosition = Math.max(0, currentDisplayIndent - 1);
          const childGutters = connectorDisplayed
            ? [...gutters, { position: connectorPosition, show: !isLast }]
            : gutters;

          // Add children in reverse order (to process in forward order via stack)
          for (let i = children.length - 1; i >= 0; i--) {
            const childIsLast = i === children.length - 1;
            stack.push([
              children[i],
              childIndent,
              multipleChildren,
              multipleChildren,
              childIsLast,
              childGutters,
              false
            ]);
          }
        }
      }

      // ============================================================
      // TREE DISPLAY TEXT (pure data -> string)
      // ============================================================

      function shortenPath(p) {
        if (typeof p !== 'string') return '';
        if (p.startsWith('/Users/')) {
          const parts = p.split('/');
          if (parts.length > 2) return '~' + p.slice(('/Users/' + parts[2]).length);
        }
        if (p.startsWith('/home/')) {
          const parts = p.split('/');
          if (parts.length > 2) return '~' + p.slice(('/home/' + parts[2]).length);
        }
        return p;
      }

      function formatToolCall(name, args) {
        switch (name) {
          case 'read': {
            const path = shortenPath(String(args.path || args.file_path || ''));
            const offset = args.offset;
            const limit = args.limit;
            let display = path;
            if (offset !== undefined || limit !== undefined) {
              const start = offset ?? 1;
              const end = limit !== undefined ? start + limit - 1 : '';
              display += `:${start}${end ? `-${end}` : ''}`;
            }
            return `[read: ${display}]`;
          }
          case 'write':
            return `[write: ${shortenPath(String(args.path || args.file_path || ''))}]`;
          case 'edit':
            return `[edit: ${shortenPath(String(args.path || args.file_path || ''))}]`;
          case 'bash': {
            const rawCmd = String(args.command || '');
            const cmd = rawCmd.replace(/[\n\t]/g, ' ').trim().slice(0, 50);
            return `[bash: ${cmd}${rawCmd.length > 50 ? '...' : ''}]`;
          }
          case 'grep':
            return `[grep: /${args.pattern || ''}/ in ${shortenPath(String(args.path || '.'))}]`;
          case 'find':
            return `[find: ${args.pattern || ''} in ${shortenPath(String(args.path || '.'))}]`;
          case 'ls':
            return `[ls: ${shortenPath(String(args.path || '.'))}]`;
          default: {
            const argsStr = JSON.stringify(args).slice(0, 40);
            return `[${name}: ${argsStr}${JSON.stringify(args).length > 40 ? '...' : ''}]`;
          }
        }
      }

      function escapeHtml(text) {
        return String(text)
          .replace(/&/g, '&amp;')
          .replace(/</g, '&lt;')
          .replace(/>/g, '&gt;')
          .replace(/"/g, '&quot;')
          .replace(/'/g, '&#39;');
      }

      function sanitizeMarkdownUrl(value) {
        const href = String(value || '').trim().replace(/[\x00-\x1f\x7f]/g, '');
        if (!href) return href;

        const scheme = href.match(/^([A-Za-z][A-Za-z0-9+.-]*):/);
        if (scheme && !/^(https?|mailto|tel|ftp)$/i.test(scheme[1])) {
          return null;
        }

        return href;
      }

      /**
       * Truncate string to maxLen chars, append "..." if truncated.
       */
      function truncate(s, maxLen = 100) {
        if (s.length <= maxLen) return s;
        return s.slice(0, maxLen) + '...';
      }

      /**
       * Get display text for tree node (returns HTML string).
       */
      function getTreeNodeDisplayHtml(entry, label) {
        const normalize = s => s.replace(/[\n\t]/g, ' ').trim();
        const labelHtml = label ? `<span class="tree-label">[${escapeHtml(label)}]</span> ` : '';

        switch (entry.type) {
          case 'message': {
            const msg = entry.message;
            if (msg.role === 'user') {
              const rawContent = extractContent(msg.content);
              const skillBlock = parseSkillBlock(rawContent);
              if (skillBlock) {
                let treeHtml = labelHtml + `<span class="tree-role-skill">skill:</span> ${escapeHtml(skillBlock.name)}`;
                if (skillBlock.userMessage) {
                  treeHtml += ` · <span class="tree-role-user">user:</span> ${escapeHtml(truncate(normalize(skillBlock.userMessage)))}`;
                }
                return treeHtml;
              }
              const content = truncate(normalize(rawContent));
              return labelHtml + `<span class="tree-role-user">user:</span> ${escapeHtml(content)}`;
            }
            if (msg.role === 'assistant') {
              const textContent = truncate(normalize(extractContent(msg.content)));
              if (textContent) {
                return labelHtml + `<span class="tree-role-assistant">assistant:</span> ${escapeHtml(textContent)}`;
              }
              if (msg.stopReason === 'aborted') {
                return labelHtml + `<span class="tree-role-assistant">assistant:</span> <span class="tree-muted">(aborted)</span>`;
              }
              if (msg.errorMessage) {
                return labelHtml + `<span class="tree-role-assistant">assistant:</span> <span class="tree-error">${escapeHtml(truncate(msg.errorMessage))}</span>`;
              }
              return labelHtml + `<span class="tree-role-assistant">assistant:</span> <span class="tree-muted">(no text)</span>`;
            }
            if (msg.role === 'toolResult') {
              const toolCall = msg.toolCallId ? toolCallMap.get(msg.toolCallId) : null;
              if (toolCall) {
                return labelHtml + `<span class="tree-role-tool">${escapeHtml(formatToolCall(toolCall.name, toolCall.arguments))}</span>`;
              }
              return labelHtml + `<span class="tree-role-tool">[${escapeHtml(msg.toolName || 'tool')}]</span>`;
            }
            if (msg.role === 'bashExecution') {
              const cmd = truncate(normalize(msg.command || ''));
              return labelHtml + `<span class="tree-role-tool">[bash]:</span> ${escapeHtml(cmd)}`;
            }
            return labelHtml + `<span class="tree-muted">[${escapeHtml(msg.role)}]</span>`;
          }
          case 'compaction':
            return labelHtml + `<span class="tree-compaction">[compaction: ${Math.round(entry.tokensBefore/1000)}k tokens]</span>`;
          case 'branch_summary': {
            const summary = truncate(normalize(entry.summary || ''));
            return labelHtml + `<span class="tree-branch-summary">[branch summary]:</span> ${escapeHtml(summary)}`;
          }
          case 'custom_message': {
            const content = typeof entry.content === 'string' ? entry.content : extractContent(entry.content);
            return labelHtml + `<span class="tree-custom">[${escapeHtml(entry.customType)}]:</span> ${escapeHtml(truncate(normalize(content)))}`;
          }
          case 'model_change':
            return labelHtml + `<span class="tree-muted">[model: ${escapeHtml(entry.modelId)}]</span>`;
          case 'thinking_level_change':
            return labelHtml + `<span class="tree-muted">[thinking: ${escapeHtml(entry.thinkingLevel)}]</span>`;
          default:
            return labelHtml + `<span class="tree-muted">[${escapeHtml(entry.type)}]</span>`;
        }
      }

      // ============================================================
      // TREE RENDERING (DOM manipulation)
      // ============================================================

      let currentLeafId = leafId;
      let currentTargetId = urlTargetId || leafId;
      let treeRendered = false;

      function renderTree() {
        const tree = buildTree();
        const activePathIds = buildActivePathIds(currentLeafId);
        const flatNodes = flattenTree(tree, activePathIds);
        const filtered = filterNodes(flatNodes, currentLeafId);
        const container = document.getElementById('tree-container');

        // Full render only on first call or when filter/search changes
        if (!treeRendered) {
          container.innerHTML = '';

          for (const flatNode of filtered) {
            const entry = flatNode.node.entry;
            const isOnPath = activePathIds.has(entry.id);
            const isTarget = entry.id === currentTargetId;

            const div = document.createElement('div');
            div.className = 'tree-node';
            if (isOnPath) div.classList.add('in-path');
            if (isTarget) div.classList.add('active');
            div.dataset.id = entry.id;

            const prefix = buildTreePrefix(flatNode);
            const prefixSpan = document.createElement('span');
            prefixSpan.className = 'tree-prefix';
            prefixSpan.textContent = prefix;

            const marker = document.createElement('span');
            marker.className = 'tree-marker';
            marker.textContent = isOnPath ? '•' : ' ';

            const content = document.createElement('span');
            content.className = 'tree-content';
            content.innerHTML = getTreeNodeDisplayHtml(entry, flatNode.node.label);

            div.appendChild(prefixSpan);
            div.appendChild(marker);
            div.appendChild(content);
            // Navigate to the newest leaf through this node, but scroll to the clicked node
            div.addEventListener('click', () => {
              if (window.getSelection().toString()) return;
              const leafId = findNewestLeaf(entry.id);
              navigateTo(leafId, 'target', entry.id);
            });

            container.appendChild(div);
          }

          treeRendered = true;
        } else {
          // Just update markers and classes
          const nodes = container.querySelectorAll('.tree-node');
          for (const node of nodes) {
            const id = node.dataset.id;
            const isOnPath = activePathIds.has(id);
            const isTarget = id === currentTargetId;

            node.classList.toggle('in-path', isOnPath);
            node.classList.toggle('active', isTarget);

            const marker = node.querySelector('.tree-marker');
            if (marker) {
              marker.textContent = isOnPath ? '•' : ' ';
            }
          }
        }

        document.getElementById('tree-status').textContent = `${filtered.length} / ${flatNodes.length} entries`;

        // Scroll active node into view after layout
        setTimeout(() => {
          const activeNode = container.querySelector('.tree-node.active');
          if (activeNode) {
            activeNode.scrollIntoView({ block: 'nearest' });
          }
        }, 0);
      }

      function forceTreeRerender() {
        treeRendered = false;
        renderTree();
      }

      // ============================================================
      // MESSAGE RENDERING
      // ============================================================

      function formatTokens(count) {
        if (count < 1000) return count.toString();
        if (count < 10000) return (count / 1000).toFixed(1) + 'k';
        if (count < 1000000) return Math.round(count / 1000) + 'k';
        return (count / 1000000).toFixed(1) + 'M';
      }

      function formatTimestamp(ts) {
        if (!ts) return '';
        const date = new Date(ts);
        return date.toLocaleTimeString(undefined, { hour: '2-digit', minute: '2-digit', second: '2-digit' });
      }

      function replaceTabs(text) {
        return text.replace(/\t/g, '   ');
      }

      /** Safely coerce value to string for display. Returns null if invalid type. */
      function str(value) {
        if (typeof value === 'string') return value;
        if (value == null) return '';
        return null;
      }

      function getLanguageFromPath(filePath) {
        const ext = filePath.split('.').pop()?.toLowerCase();
        const extToLang = {
          ts: 'typescript', tsx: 'typescript', js: 'javascript', jsx: 'javascript',
          py: 'python', rb: 'ruby', rs: 'rust', go: 'go', java: 'java',
          c: 'c', cpp: 'cpp', h: 'c', hpp: 'cpp', cs: 'csharp',
          php: 'php', sh: 'bash', bash: 'bash', zsh: 'bash',
          sql: 'sql', html: 'html', css: 'css', scss: 'scss',
          json: 'json', yaml: 'yaml', yml: 'yaml', xml: 'xml',
          md: 'markdown', dockerfile: 'dockerfile'
        };
        return extToLang[ext];
      }

      function findToolResult(toolCallId) {
        for (const entry of entries) {
          if (entry.type === 'message' && entry.message.role === 'toolResult') {
            if (entry.message.toolCallId === toolCallId) {
              return entry.message;
            }
          }
        }
        return null;
      }

      function formatExpandableOutput(text, maxLines, lang) {
        text = replaceTabs(text);
        const lines = text.split('\n');
        const displayLines = lines.slice(0, maxLines);
        const remaining = lines.length - maxLines;

        if (lang) {
          let highlighted;
          try {
            highlighted = hljs.highlight(text, { language: lang }).value;
          } catch {
            highlighted = escapeHtml(text);
          }

          if (remaining > 0) {
            const previewCode = displayLines.join('\n');
            let previewHighlighted;
            try {
              previewHighlighted = hljs.highlight(previewCode, { language: lang }).value;
            } catch {
              previewHighlighted = escapeHtml(previewCode);
            }

            return `<div class="tool-output expandable" onclick="if(window.getSelection().toString())return;this.classList.toggle('expanded')">
              <div class="output-preview"><pre><code class="hljs">${previewHighlighted}</code></pre>

              <div class="expand-hint">... (${remaining} more lines)</div></div>
              <div class="output-full"><pre><code class="hljs">${highlighted}</code></pre></div></div>`;
          }

          return `<div class="tool-output"><pre><code class="hljs">${highlighted}</code></pre></div>`;
        }

        // Plain text output
        if (remaining > 0) {
          let out = '<div class="tool-output expandable" onclick="if(window.getSelection().toString())return;this.classList.toggle(\'expanded\')">';
          out += '<div class="output-preview">';
          for (const line of displayLines) {
            out += `<div>${escapeHtml(replaceTabs(line))}</div>`;
          }
          out += `<div class="expand-hint">... (${remaining} more lines)</div></div>`;
          out += '<div class="output-full">';
          for (const line of lines) {
            out += `<div>${escapeHtml(replaceTabs(line))}</div>`;
          }
          out += '</div></div>';
          return out;
        }

        let out = '<div class="tool-output">';
        for (const line of displayLines) {
          out += `<div>${escapeHtml(replaceTabs(line))}</div>`;
        }
        out += '</div>';
        return out;
      }

      function renderToolCall(call) {
        const result = findToolResult(call.id);
        const isError = result?.isError || false;
        const statusClass = result ? (isError ? 'error' : 'success') : 'pending';

        const getResultText = () => {
          if (!result) return '';
          const textBlocks = result.content.filter(c => c.type === 'text');
          return textBlocks.map(c => c.text).join('\n');
        };

        const getResultImages = () => {
          if (!result) return [];
          return result.content.filter(c => c.type === 'image');
        };

        const renderResultImages = () => {
          const images = getResultImages();
          if (images.length === 0) return '';
          return '<div class="tool-images">' +
            images.map(img => `<img src="data:${escapeHtml(img.mimeType || 'image/png')};base64,${escapeHtml(img.data || '')}" class="tool-image" />`).join('') +
            '</div>';
        };

        const toolDomId = `tool-call-${escapeHtml(call.id)}`;
        let html = `<div class="tool-execution ${statusClass}" id="${toolDomId}">`;
        const args = call.arguments || {};
        const name = call.name;

        const invalidArg = '<span class="tool-error">[invalid arg]</span>';

        switch (name) {
          case 'bash': {
            const command = str(args.command);
            const cmdDisplay = command === null ? invalidArg : escapeHtml(command || '...');
            html += `<div class="tool-command">$ ${cmdDisplay}</div>`;
            if (result) {
              const output = getResultText().trim();
              if (output) html += formatExpandableOutput(output, 5);
            }
            break;
          }
          case 'read': {
            const filePath = str(args.file_path ?? args.path);
            const offset = args.offset;
            const limit = args.limit;

            let pathHtml = filePath === null ? invalidArg : escapeHtml(shortenPath(filePath || ''));
            if (filePath !== null && (offset !== undefined || limit !== undefined)) {
              const startLine = offset ?? 1;
              const endLine = limit !== undefined ? startLine + limit - 1 : '';
              pathHtml += `<span class="line-numbers">:${startLine}${endLine ? '-' + endLine : ''}</span>`;
            }

            html += `<div class="tool-header"><span class="tool-name">read</span> <span class="tool-path">${pathHtml}</span></div>`;
            if (result) {
              html += renderResultImages();
              const output = getResultText();
              const lang = filePath ? getLanguageFromPath(filePath) : null;
              if (output) html += formatExpandableOutput(output, 10, lang);
            }
            break;
          }
          case 'write': {
            const filePath = str(args.file_path ?? args.path);
            const content = str(args.content);

            html += `<div class="tool-header"><span class="tool-name">write</span> <span class="tool-path">${filePath === null ? invalidArg : escapeHtml(shortenPath(filePath || ''))}</span>`;
            if (content !== null && content) {
              const lines = content.split('\n');
              if (lines.length > 10) html += ` <span class="line-count">(${lines.length} lines)</span>`;
            }
            html += '</div>';

            if (content === null) {
              html += `<div class="tool-error">[invalid content arg - expected string]</div>`;
            } else if (content) {
              const lang = filePath ? getLanguageFromPath(filePath) : null;
              html += formatExpandableOutput(content, 10, lang);
            }
            if (result) {
              const output = getResultText().trim();
              if (output) html += `<div class="tool-output"><div>${escapeHtml(output)}</div></div>`;
            }
            break;
          }
          case 'edit': {
            const filePath = str(args.file_path ?? args.path);
            html += `<div class="tool-header"><span class="tool-name">edit</span> <span class="tool-path">${filePath === null ? invalidArg : escapeHtml(shortenPath(filePath || ''))}</span></div>`;

            if (result?.details?.diff) {
              const diffLines = result.details.diff.split('\n');
              html += '<div class="tool-diff">';
              for (const line of diffLines) {
                const cls = line.match(/^\+/) ? 'diff-added' : line.match(/^-/) ? 'diff-removed' : 'diff-context';
                html += `<div class="${cls}">${escapeHtml(replaceTabs(line))}</div>`;
              }
              html += '</div>';
            } else if (result) {
              const output = getResultText().trim();
              if (output) html += `<div class="tool-output"><pre>${escapeHtml(output)}</pre></div>`;
            }
            break;
          }
          case 'ls': {
            const dirPath = str(args.path);
            const limit = args.limit;

            let pathHtml = dirPath === null ? invalidArg : escapeHtml(shortenPath(dirPath || '.'));
            if (limit !== undefined) {
              pathHtml += ` <span class="line-count">(limit ${escapeHtml(String(limit))})</span>`;
            }

            html += `<div class="tool-header"><span class="tool-name">ls</span> <span class="tool-path">${pathHtml}</span></div>`;
            if (result) {
              const output = getResultText().trim();
              if (output) html += formatExpandableOutput(output, 20);
            }
            break;
          }
          default: {
            // Check for pre-rendered custom tool HTML
            const rendered = renderedTools?.[call.id];
            if (rendered?.callHtml || rendered?.resultHtmlCollapsed || rendered?.resultHtmlExpanded) {
              // Custom tool with pre-rendered HTML from TUI renderer
              if (rendered.callHtml) {
                html += `<div class="tool-header ansi-rendered">${rendered.callHtml}</div>`;
              } else {
                html += `<div class="tool-header"><span class="tool-name">${escapeHtml(name)}</span></div>`;
              }

              if (rendered.resultHtmlCollapsed && rendered.resultHtmlExpanded && rendered.resultHtmlCollapsed !== rendered.resultHtmlExpanded) {
                // Both collapsed and expanded differ - render expandable section
                html += `<div class="tool-output expandable ansi-rendered" onclick="if(window.getSelection().toString())return;this.classList.toggle('expanded')">
                  <div class="output-preview">${rendered.resultHtmlCollapsed}</div>
                  <div class="output-full">${rendered.resultHtmlExpanded}</div>
                </div>`;
              } else if (rendered.resultHtmlExpanded) {
                // Only expanded exists (or collapsed is identical) - show directly
                html += `<div class="tool-output ansi-rendered">${rendered.resultHtmlExpanded}</div>`;
              } else if (result) {
                // No pre-rendered result HTML - fallback to JSON
                const output = getResultText();
                if (output) html += formatExpandableOutput(output, 10);
              }
            } else {
              // Fallback to JSON display (existing behavior)
              html += `<div class="tool-header"><span class="tool-name">${escapeHtml(name)}</span></div>`;
              html += `<div class="tool-output"><pre>${escapeHtml(JSON.stringify(args, null, 2))}</pre></div>`;
              if (result) {
                const output = getResultText();
                if (output) html += formatExpandableOutput(output, 10);
              }
            }
          }
        }

        html += '</div>';
        return html;
      }

      /**
       * Download the session data as a JSONL file.
       * Reconstructs the original format: header line + entry lines.
       */
      window.downloadSessionJson = function() {
        // Build JSONL content: header first, then all entries
        const lines = [];
        if (header) {
          lines.push(JSON.stringify({ type: 'header', ...header }));
        }
        for (const entry of entries) {
          lines.push(JSON.stringify(entry));
        }
        const jsonlContent = lines.join('\n');

        // Create download
        const blob = new Blob([jsonlContent], { type: 'application/x-ndjson' });
        const url = URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.href = url;
        a.download = `${header?.id || 'session'}.jsonl`;
        document.body.appendChild(a);
        a.click();
        document.body.removeChild(a);
        URL.revokeObjectURL(url);
      }

      /**
       * Build a shareable URL for a specific message.
       * URL format: base?gistId&leafId=<leafId>&targetId=<entryId>
       */
      function buildShareUrl(entryId) {
        // Check for injected base URL (used when loaded in iframe via srcdoc)
        const baseUrlMeta = document.querySelector('meta[name="pi-share-base-url"]');
        const baseUrl = baseUrlMeta ? baseUrlMeta.content : window.location.href.split('?')[0];

        const url = new URL(window.location.href);
        // Find the gist ID (first query param without value, e.g., ?abc123)
        const gistId = Array.from(url.searchParams.keys()).find(k => !url.searchParams.get(k));

        // Build the share URL
        const params = new URLSearchParams();
        params.set('leafId', currentLeafId);
        params.set('targetId', entryId);

        // If we have an injected base URL (iframe context), use it directly
        if (baseUrlMeta) {
          return `${baseUrl}&${params.toString()}`;
        }

        // Otherwise build from current location (direct file access)
        url.search = gistId ? `?${gistId}&${params.toString()}` : `?${params.toString()}`;
        return url.toString();
      }

      /**
       * Copy text to clipboard with visual feedback.
       * Uses navigator.clipboard with fallback to execCommand for HTTP contexts.
       */
      async function copyToClipboard(text, button) {
        let success = false;
        try {
          if (navigator.clipboard && navigator.clipboard.writeText) {
            await navigator.clipboard.writeText(text);
            success = true;
          }
        } catch (err) {
          // Clipboard API failed, try fallback
        }

        // Fallback for HTTP or when Clipboard API is unavailable
        if (!success) {
          try {
            const textarea = document.createElement('textarea');
            textarea.value = text;
            textarea.style.position = 'fixed';
            textarea.style.opacity = '0';
            document.body.appendChild(textarea);
            textarea.select();
            success = document.execCommand('copy');
            document.body.removeChild(textarea);
          } catch (err) {
            console.error('Failed to copy:', err);
          }
        }

        if (success && button) {
          const originalHtml = button.innerHTML;
          button.innerHTML = '✓';
          button.classList.add('copied');
          setTimeout(() => {
            button.innerHTML = originalHtml;
            button.classList.remove('copied');
          }, 1500);
        }
      }

      /**
       * Render the copy-link button HTML for a message.
       */
      function renderCopyLinkButton(entryId) {
        return `<button class="copy-link-btn" data-entry-id="${escapeHtml(entryId)}" title="Copy link to this message">
          <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
            <path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"/>
            <path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"/>
          </svg>
        </button>`;
      }

      function renderEntry(entry) {
        const ts = formatTimestamp(entry.timestamp);
        const tsHtml = ts ? `<div class="message-timestamp">${ts}</div>` : '';
        const entryDomId = `entry-${escapeHtml(entry.id)}`;
        const copyBtnHtml = renderCopyLinkButton(entry.id);

        if (entry.type === 'message') {
          const msg = entry.message;

          if (msg.role === 'user') {
            const content = msg.content;
            const text = typeof content === 'string' ? content :
              content.filter(c => c.type === 'text').map(c => c.text).join('\n');
            const skillBlock = parseSkillBlock(text);

            if (skillBlock) {
              // Collect images from content array
              const images = Array.isArray(content) ? content.filter(c => c.type === 'image') : [];
              const hasUserContent = skillBlock.userMessage || images.length > 0;
              let html = `<div class="skill-user-entry" id="${entryDomId}">${copyBtnHtml}${tsHtml}`;

              // Skill invocation (collapsed by default, click to expand)
              html += `<div class="skill-invocation" onclick="if(window.getSelection().toString())return;this.classList.toggle('expanded')">
                <div class="skill-invocation-label">[skill] ${escapeHtml(skillBlock.name)}</div>
                <div class="skill-invocation-collapsed">${escapeHtml(skillBlock.name)} (click to expand)</div>
                <div class="skill-invocation-content markdown-content">${safeMarkedParse(skillBlock.content)}</div>
              </div>`;

              // User message (separate block if present)
              if (hasUserContent) {
                html += '<div class="user-message">';
                if (images.length > 0) {
                  html += '<div class="message-images">';
                  for (const img of images) {
                    html += `<img src="data:${escapeHtml(img.mimeType || 'image/png')};base64,${escapeHtml(img.data || '')}" class="message-image" />`;
                  }
                  html += '</div>';
                }
                if (skillBlock.userMessage) {
                  html += `<div class="markdown-content">${safeMarkedParse(skillBlock.userMessage)}</div>`;
                }
                html += '</div>';
              }

              html += '</div>';
              return html;
            }

            // No skill block - normal user message
            let html = `<div class="user-message" id="${entryDomId}">${copyBtnHtml}${tsHtml}`;

            if (Array.isArray(content)) {
              const images = content.filter(c => c.type === 'image');
              if (images.length > 0) {
                html += '<div class="message-images">';
                for (const img of images) {
                  html += `<img src="data:${escapeHtml(img.mimeType || 'image/png')};base64,${escapeHtml(img.data || '')}" class="message-image" />`;
                }
                html += '</div>';
              }
            }

            if (text.trim()) {
              html += `<div class="markdown-content">${safeMarkedParse(text)}</div>`;
            }
            html += '</div>';
            return html;
          }

          if (msg.role === 'assistant') {
            let html = `<div class="assistant-message" id="${entryDomId}">${copyBtnHtml}${tsHtml}`;

            for (const block of msg.content) {
              if (block.type === 'text' && block.text.trim()) {
                html += `<div class="assistant-text markdown-content">${safeMarkedParse(block.text)}</div>`;
              } else if (block.type === 'thinking' && block.thinking.trim()) {
                html += `<div class="thinking-block">
                  <div class="thinking-text">${escapeHtml(block.thinking)}</div>
                  <div class="thinking-collapsed">Thinking ...</div>
                </div>`;
              }
            }

            for (const block of msg.content) {
              if (block.type === 'toolCall') {
                html += renderToolCall(block);
              }
            }

            if (msg.stopReason === 'aborted') {
              html += '<div class="error-text">Aborted</div>';
            } else if (msg.stopReason === 'error') {
              html += `<div class="error-text">Error: ${escapeHtml(msg.errorMessage || 'Unknown error')}</div>`;
            }

            html += '</div>';
            return html;
          }

          if (msg.role === 'bashExecution') {
            const isError = msg.cancelled || (msg.exitCode !== 0 && msg.exitCode !== null);
            let html = `<div class="tool-execution ${isError ? 'error' : 'success'}" id="${entryDomId}">${tsHtml}`;
            html += `<div class="tool-command">$ ${escapeHtml(msg.command)}</div>`;
            if (msg.output) html += formatExpandableOutput(msg.output, 10);
            if (msg.cancelled) {
              html += '<div style="color: var(--warning)">(cancelled)</div>';
            } else if (msg.exitCode !== 0 && msg.exitCode !== null) {
              html += `<div style="color: var(--error)">(exit ${msg.exitCode})</div>`;
            }
            html += '</div>';
            return html;
          }

          if (msg.role === 'toolResult') return '';
        }

        if (entry.type === 'model_change') {
          return `<div class="model-change" id="${entryDomId}">${tsHtml}Switched to model: <span class="model-name">${escapeHtml(entry.provider)}/${escapeHtml(entry.modelId)}</span></div>`;
        }

        if (entry.type === 'compaction') {
          return `<div class="compaction" id="${entryDomId}" onclick="if(window.getSelection().toString())return;this.classList.toggle('expanded')">
            <div class="compaction-label">[compaction]</div>
            <div class="compaction-collapsed">Compacted from ${entry.tokensBefore.toLocaleString()} tokens</div>
            <div class="compaction-content"><strong>Compacted from ${entry.tokensBefore.toLocaleString()} tokens</strong>\n\n${escapeHtml(entry.summary)}</div>
          </div>`;
        }

        if (entry.type === 'branch_summary') {
          return `<div class="branch-summary" id="${entryDomId}">${tsHtml}
            <div class="branch-summary-header">Branch Summary</div>
            <div class="markdown-content">${safeMarkedParse(entry.summary)}</div>
          </div>`;
        }

        if (entry.type === 'custom_message' && entry.display) {
          return `<div class="hook-message" id="${entryDomId}">${tsHtml}
            <div class="hook-type">[${escapeHtml(entry.customType)}]</div>
            <div class="markdown-content">${safeMarkedParse(typeof entry.content === 'string' ? entry.content : JSON.stringify(entry.content))}</div>
          </div>`;
        }

        return '';
      }

      // ============================================================
      // HEADER / STATS
      // ============================================================

      function computeStats(entryList) {
        let userMessages = 0, assistantMessages = 0, toolResults = 0;
        let customMessages = 0, compactions = 0, branchSummaries = 0, toolCalls = 0;
        const tokens = { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 };
        const cost = { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 };
        const models = new Set();

        for (const entry of entryList) {
          if (entry.type === 'message') {
            const msg = entry.message;
            if (msg.role === 'user') userMessages++;
            if (msg.role === 'assistant') {
              assistantMessages++;
              if (msg.model) models.add(msg.provider ? `${msg.provider}/${msg.model}` : msg.model);
              if (msg.usage) {
                tokens.input += msg.usage.input || 0;
                tokens.output += msg.usage.output || 0;
                tokens.cacheRead += msg.usage.cacheRead || 0;
                tokens.cacheWrite += msg.usage.cacheWrite || 0;
                if (msg.usage.cost) {
                  cost.input += msg.usage.cost.input || 0;
                  cost.output += msg.usage.cost.output || 0;
                  cost.cacheRead += msg.usage.cost.cacheRead || 0;
                  cost.cacheWrite += msg.usage.cost.cacheWrite || 0;
                }
              }
              toolCalls += msg.content.filter(c => c.type === 'toolCall').length;
            }
            if (msg.role === 'toolResult') toolResults++;
          } else if (entry.type === 'compaction') {
            compactions++;
          } else if (entry.type === 'branch_summary') {
            branchSummaries++;
          } else if (entry.type === 'custom_message') {
            customMessages++;
          }
        }

        return { userMessages, assistantMessages, toolResults, customMessages, compactions, branchSummaries, toolCalls, tokens, cost, models: Array.from(models) };
      }

      const globalStats = computeStats(entries);

      function renderHeader() {
        const totalCost = globalStats.cost.input + globalStats.cost.output + globalStats.cost.cacheRead + globalStats.cost.cacheWrite;

        const tokenParts = [];
        if (globalStats.tokens.input) tokenParts.push(`↑${formatTokens(globalStats.tokens.input)}`);
        if (globalStats.tokens.output) tokenParts.push(`↓${formatTokens(globalStats.tokens.output)}`);
        if (globalStats.tokens.cacheRead) tokenParts.push(`R${formatTokens(globalStats.tokens.cacheRead)}`);
        if (globalStats.tokens.cacheWrite) tokenParts.push(`W${formatTokens(globalStats.tokens.cacheWrite)}`);

        const msgParts = [];
        if (globalStats.userMessages) msgParts.push(`${globalStats.userMessages} user`);
        if (globalStats.assistantMessages) msgParts.push(`${globalStats.assistantMessages} assistant`);
        if (globalStats.toolResults) msgParts.push(`${globalStats.toolResults} tool results`);
        if (globalStats.customMessages) msgParts.push(`${globalStats.customMessages} custom`);
        if (globalStats.compactions) msgParts.push(`${globalStats.compactions} compactions`);
        if (globalStats.branchSummaries) msgParts.push(`${globalStats.branchSummaries} branch summaries`);

        let html = `
          <div class="header">
            <h1>Session: ${escapeHtml(header?.id || 'unknown')}</h1>
            <div class="help-bar">
              <span class="help-hint">T toggle thinking · O toggle tools</span>
              <div class="help-actions">
                <button type="button" class="header-toggle-btn" data-action="toggle-thinking" title="Toggle thinking (T)">Toggle thinking</button>
                <button type="button" class="header-toggle-btn" data-action="toggle-tools" title="Toggle tools (O)">Toggle tools</button>
                <button type="button" class="download-json-btn" onclick="downloadSessionJson()" title="Download session as JSONL">↓ JSONL</button>
              </div>
            </div>
            <div class="header-info">
              <div class="info-item"><span class="info-label">Date:</span><span class="info-value">${header?.timestamp ? new Date(header.timestamp).toLocaleString() : 'unknown'}</span></div>
              <div class="info-item"><span class="info-label">Models:</span><span class="info-value">${escapeHtml(globalStats.models.join(', ') || 'unknown')}</span></div>
              <div class="info-item"><span class="info-label">Messages:</span><span class="info-value">${msgParts.join(', ') || '0'}</span></div>
              <div class="info-item"><span class="info-label">Tool Calls:</span><span class="info-value">${globalStats.toolCalls}</span></div>
              <div class="info-item"><span class="info-label">Tokens:</span><span class="info-value">${tokenParts.join(' ') || '0'}</span></div>
              <div class="info-item"><span class="info-label">Cost:</span><span class="info-value">${totalCost.toFixed(3)}</span></div>
            </div>
          </div>`;

        // Render system prompt (user's base prompt, applies to all providers)
        if (systemPrompt) {
          const lines = systemPrompt.split('\n');
          const previewLines = 10;
          if (lines.length > previewLines) {
            const preview = lines.slice(0, previewLines).join('\n');
            const remaining = lines.length - previewLines;
            html += `<div class="system-prompt expandable" onclick="if(window.getSelection().toString())return;this.classList.toggle('expanded')">
              <div class="system-prompt-header">System Prompt</div>
              <div class="system-prompt-preview">${escapeHtml(preview)}</div>
              <div class="system-prompt-expand-hint">... (${remaining} more lines, click to expand)</div>
              <div class="system-prompt-full">${escapeHtml(systemPrompt)}</div>
            </div>`;
          } else {
            html += `<div class="system-prompt">
              <div class="system-prompt-header">System Prompt</div>
              <div class="system-prompt-full" style="display: block">${escapeHtml(systemPrompt)}</div>
            </div>`;
          }
        }

        if (tools && tools.length > 0) {
          html += `<div class="tools-list">
            <div class="tools-header">Available Tools</div>
            <div class="tools-content">
              ${tools.map(t => {
                const hasParams = t.parameters && typeof t.parameters === 'object' && t.parameters.properties && Object.keys(t.parameters.properties).length > 0;
                if (!hasParams) {
                  return `<div class="tool-item"><span class="tool-item-name">${escapeHtml(t.name)}</span> - <span class="tool-item-desc">${escapeHtml(t.description)}</span></div>`;
                }
                const params = t.parameters;
                const properties = params.properties;
                const required = params.required || [];
                let paramsHtml = '';
                for (const [name, prop] of Object.entries(properties)) {
                  const isRequired = required.includes(name);
                  const typeStr = prop.type || 'any';
                  const reqLabel = isRequired ? '<span class="tool-param-required">required</span>' : '<span class="tool-param-optional">optional</span>';
                  paramsHtml += `<div class="tool-param"><span class="tool-param-name">${escapeHtml(name)}</span> <span class="tool-param-type">${escapeHtml(typeStr)}</span> ${reqLabel}`;
                  if (prop.description) {
                    paramsHtml += `<div class="tool-param-desc">${escapeHtml(prop.description)}</div>`;
                  }
                  paramsHtml += `</div>`;
                }
                return `<div class="tool-item" onclick="if(window.getSelection().toString())return;this.classList.toggle('params-expanded')"><span class="tool-item-name">${escapeHtml(t.name)}</span> - <span class="tool-item-desc">${escapeHtml(t.description)}</span> <span class="tool-params-hint"></span><div class="tool-params-content">${paramsHtml}</div></div>`;
              }).join('')}
            </div>
          </div>`;
        }

        return html;
      }

      // ============================================================
      // NAVIGATION
      // ============================================================

      // Cache for rendered entry DOM nodes
      const entryCache = new Map();

      function getScrollTargetElementId(entryId) {
        const entry = byId.get(entryId);
        if (entry?.type === 'message' && entry.message.role === 'toolResult' && entry.message.toolCallId) {
          // getElementById() matches the parsed DOM id attribute, whose HTML entities
          // were already resolved from the escaped id rendered by renderToolCall().
          return `tool-call-${entry.message.toolCallId}`;
        }
        return `entry-${entryId}`;
      }

      function renderEntryToNode(entry) {
        // Check cache first
        if (entryCache.has(entry.id)) {
          return entryCache.get(entry.id).cloneNode(true);
        }

        // Render to HTML string, then parse to node
        const html = renderEntry(entry);
        if (!html) return null;

        const template = document.createElement('template');
        template.innerHTML = html;
        const node = template.content.firstElementChild;

        // Cache the node
        if (node) {
          entryCache.set(entry.id, node.cloneNode(true));
        }
        return node;
      }

      function navigateTo(targetId, scrollMode = 'target', scrollToEntryId = null) {
        currentLeafId = targetId;
        currentTargetId = scrollToEntryId || targetId;
        const path = getPath(targetId);

        renderTree();

        document.getElementById('header-container').innerHTML = renderHeader();
        attachHeaderHandlers();

        // Build messages using cached DOM nodes
        const messagesEl = document.getElementById('messages');
        const fragment = document.createDocumentFragment();

        for (const entry of path) {
          const node = renderEntryToNode(entry);
          if (node) {
            fragment.appendChild(node);
          }
        }

        messagesEl.innerHTML = '';
        messagesEl.appendChild(fragment);

        // Attach click handlers for copy-link buttons
        messagesEl.querySelectorAll('.copy-link-btn').forEach(btn => {
          btn.addEventListener('click', (e) => {
            e.stopPropagation();
            const entryId = btn.dataset.entryId;
            const shareUrl = buildShareUrl(entryId);
            copyToClipboard(shareUrl, btn);
          });
        });

        // Use setTimeout(0) to ensure DOM is fully laid out before scrolling
        setTimeout(() => {
          const content = document.getElementById('content');
          if (scrollMode === 'bottom') {
            content.scrollTop = content.scrollHeight;
          } else if (scrollMode === 'target') {
            // If scrollToEntryId is provided, scroll to that specific entry.
            // Tool result entries are rendered inside their assistant tool-call block,
            // so route them to the visible tool-call element instead.
            const scrollTargetId = scrollToEntryId || targetId;
            const targetEl = document.getElementById(getScrollTargetElementId(scrollTargetId)) ||
              document.getElementById(`entry-${scrollTargetId}`);
            if (targetEl) {
              targetEl.scrollIntoView({ block: 'center' });
              // Briefly highlight the target message
              if (scrollToEntryId) {
                targetEl.classList.add('highlight');
                setTimeout(() => targetEl.classList.remove('highlight'), 2000);
              }
            }
          }
        }, 0);
      }

      // ============================================================
      // INITIALIZATION
      // ============================================================

      // Configure marked with syntax highlighting and TUI-compatible HTML handling
      const strictStrikethroughRegex = /^(~~)(?=[^\s~])((?:\\.|[^\\])*?(?:\\.|[^\s~\\]))\1(?=[^~]|$)/;

      marked.use({
        breaks: true,
        gfm: true,
        tokenizer: {
          // Treat HTML-like input as plain text so tags are shown verbatim,
          // matching the TUI markdown renderer.
          html() {
            return undefined;
          },
          tag() {
            return undefined;
          },
          del(src) {
            const match = strictStrikethroughRegex.exec(src);
            if (!match) return undefined;
            return {
              type: 'del',
              raw: match[0],
              text: match[2],
              tokens: this.lexer.inlineTokens(match[2])
            };
          }
        },
        renderer: {
          // Sanitize link URLs with a scheme allow-list. Browsers strip C0
          // controls from schemes, so strip them before checking and emitting.
          link(token) {
            const href = sanitizeMarkdownUrl(token.href);
            if (href === null) {
              return this.parser.parseInline(token.tokens);
            }
            let out = '<a href="' + escapeHtml(href) + '"';
            if (token.title) {
              out += ' title="' + escapeHtml(token.title) + '"';
            }
            out += '>' + this.parser.parseInline(token.tokens) + '</a>';
            return out;
          },
          // Sanitize image src URLs with the same scheme allow-list.
          image(token) {
            const href = sanitizeMarkdownUrl(token.href);
            if (href === null) {
              return escapeHtml(token.text || '');
            }
            let out = '<img src="' + escapeHtml(href) + '" alt="' + escapeHtml(token.text || '') + '"';
            if (token.title) {
              out += ' title="' + escapeHtml(token.title) + '"';
            }
            out += '>';
            return out;
          },
          // Code blocks: syntax highlight, no HTML escaping
          code(token) {
            const code = token.text;
            const lang = token.lang;
            let highlighted;
            if (lang && hljs.getLanguage(lang)) {
              try {
                highlighted = hljs.highlight(code, { language: lang }).value;
              } catch {
                highlighted = escapeHtml(code);
              }
            } else {
              // Auto-detect language if not specified
              try {
                highlighted = hljs.highlightAuto(code).value;
              } catch {
                highlighted = escapeHtml(code);
              }
            }
            return `<pre><code class="hljs">${highlighted}</code></pre>`;
          },
          // Inline code: escape HTML
          codespan(token) {
            return `<code>${escapeHtml(token.text)}</code>`;
          }
        }
      });

      // Simple marked parse (escaping handled in renderers)
      function safeMarkedParse(text) {
        return marked.parse(text);
      }

      // Search input
      const searchInput = document.getElementById('tree-search');
      searchInput.addEventListener('input', (e) => {
        searchQuery = e.target.value;
        forceTreeRerender();
      });

      // Filter buttons
      document.querySelectorAll('.filter-btn').forEach(btn => {
        btn.addEventListener('click', () => {
          document.querySelectorAll('.filter-btn').forEach(b => b.classList.remove('active'));
          btn.classList.add('active');
          filterMode = btn.dataset.filter;
          forceTreeRerender();
        });
      });

      // Sidebar toggle
      const sidebar = document.getElementById('sidebar');
      const overlay = document.getElementById('sidebar-overlay');
      const hamburger = document.getElementById('hamburger');
      const sidebarResizer = document.getElementById('sidebar-resizer');
      const SIDEBAR_WIDTH_STORAGE_KEY = 'pi-share:v1:sidebar-width';
      const MIN_CONTENT_WIDTH = 320;

      function isMobileLayout() {
        return window.matchMedia('(max-width: 900px)').matches;
      }

      function getSidebarBounds() {
        const rootStyles = getComputedStyle(document.documentElement);
        const minWidth = parseFloat(rootStyles.getPropertyValue('--sidebar-min-width')) || 240;
        const maxWidth = parseFloat(rootStyles.getPropertyValue('--sidebar-max-width')) || 720;
        const viewportMaxWidth = window.innerWidth - MIN_CONTENT_WIDTH;
        return {
          minWidth,
          maxWidth: Math.max(minWidth, Math.min(maxWidth, viewportMaxWidth))
        };
      }

      function clampSidebarWidth(width) {
        const { minWidth, maxWidth } = getSidebarBounds();
        return Math.max(minWidth, Math.min(maxWidth, width));
      }

      function applySidebarWidth(width) {
        document.documentElement.style.setProperty('--sidebar-width', `${Math.round(clampSidebarWidth(width))}px`);
      }

      function loadSidebarWidth() {
        try {
          const raw = localStorage.getItem(SIDEBAR_WIDTH_STORAGE_KEY);
          if (raw === null) return null;
          const width = Number(raw);
          return Number.isFinite(width) ? width : null;
        } catch {
          return null;
        }
      }

      function saveSidebarWidth(width) {
        try {
          localStorage.setItem(SIDEBAR_WIDTH_STORAGE_KEY, String(Math.round(clampSidebarWidth(width))));
        } catch {
          // Ignore storage failures (e.g. private browsing restrictions)
        }
      }

      function setupSidebarResize() {
        const savedWidth = loadSidebarWidth();
        if (savedWidth !== null) {
          applySidebarWidth(savedWidth);
        }

        if (!sidebarResizer) return;

        let cleanupDrag = null;

        const stopDrag = (pointerId) => {
          if (cleanupDrag) {
            cleanupDrag(pointerId);
            cleanupDrag = null;
          }
        };

        sidebarResizer.addEventListener('pointerdown', (e) => {
          if (isMobileLayout()) return;

          e.preventDefault();
          const startX = e.clientX;
          const startWidth = sidebar.getBoundingClientRect().width;
          document.body.classList.add('sidebar-resizing');
          sidebarResizer.setPointerCapture?.(e.pointerId);

          const onPointerMove = (event) => {
            applySidebarWidth(startWidth + (event.clientX - startX));
          };

          cleanupDrag = (pointerIdToRelease) => {
            document.body.classList.remove('sidebar-resizing');
            sidebarResizer.releasePointerCapture?.(pointerIdToRelease);
            window.removeEventListener('pointermove', onPointerMove);
            window.removeEventListener('pointerup', onPointerUp);
            window.removeEventListener('pointercancel', onPointerCancel);
            saveSidebarWidth(sidebar.getBoundingClientRect().width);
          };

          const onPointerUp = (event) => stopDrag(event.pointerId);
          const onPointerCancel = (event) => stopDrag(event.pointerId);

          window.addEventListener('pointermove', onPointerMove);
          window.addEventListener('pointerup', onPointerUp);
          window.addEventListener('pointercancel', onPointerCancel);
        });

        sidebarResizer.addEventListener('dblclick', () => {
          if (isMobileLayout()) return;
          applySidebarWidth(400);
          saveSidebarWidth(400);
        });

        window.addEventListener('resize', () => {
          if (isMobileLayout()) return;
          applySidebarWidth(sidebar.getBoundingClientRect().width);
        });
      }

      setupSidebarResize();

      hamburger.addEventListener('click', () => {
        sidebar.classList.add('open');
        overlay.classList.add('open');
        hamburger.style.display = 'none';
      });

      const closeSidebar = () => {
        sidebar.classList.remove('open');
        overlay.classList.remove('open');
        hamburger.style.display = '';
      };

      overlay.addEventListener('click', closeSidebar);
      document.getElementById('sidebar-close').addEventListener('click', closeSidebar);

      // Toggle states
      let thinkingExpanded = true;
      let toolOutputsExpanded = false;

      const toggleThinking = () => {
        thinkingExpanded = !thinkingExpanded;
        document.querySelectorAll('.thinking-text').forEach(el => {
          el.style.display = thinkingExpanded ? '' : 'none';
        });
        document.querySelectorAll('.thinking-collapsed').forEach(el => {
          el.style.display = thinkingExpanded ? 'none' : 'block';
        });
      };

      const toggleToolOutputs = () => {
        toolOutputsExpanded = !toolOutputsExpanded;
        document.querySelectorAll('.tool-output.expandable').forEach(el => {
          el.classList.toggle('expanded', toolOutputsExpanded);
        });
        document.querySelectorAll('.compaction').forEach(el => {
          el.classList.toggle('expanded', toolOutputsExpanded);
        });
        document.querySelectorAll('.skill-invocation').forEach(el => {
          el.classList.toggle('expanded', toolOutputsExpanded);
        });
      };

      const attachHeaderHandlers = () => {
        document.querySelector('[data-action="toggle-thinking"]')?.addEventListener('click', toggleThinking);
        document.querySelector('[data-action="toggle-tools"]')?.addEventListener('click', toggleToolOutputs);
      };

      const isEditableTarget = (element) => {
        if (!element) return false;
        const tagName = element.tagName;
        if (tagName === 'INPUT' || tagName === 'TEXTAREA' || tagName === 'SELECT' || tagName === 'BUTTON') {
          return true;
        }
        return element.isContentEditable || Boolean(element.closest?.('[contenteditable="true"]'));
      };

      // Keyboard shortcuts
      document.addEventListener('keydown', (e) => {
        if (e.key === 'Escape') {
          searchInput.value = '';
          searchQuery = '';
          navigateTo(leafId, 'bottom');
        }

        if (isEditableTarget(document.activeElement)) {
          return;
        }

        const key = e.key.toLowerCase();
        if (key === 't') {
          e.preventDefault();
          toggleThinking();
        } else if (key === 'o') {
          e.preventDefault();
          toggleToolOutputs();
        }
      });

      // Initial render
      // If URL has targetId, scroll to that specific message; otherwise stay at top
      if (leafId) {
        if (urlTargetId && byId.has(urlTargetId)) {
          // Deep link: navigate to leaf and scroll to target message
          navigateTo(leafId, 'target', urlTargetId);
        } else {
          navigateTo(leafId, 'none');
        }
      } else if (entries.length > 0) {
        // Fallback: use last entry if no leafId
        navigateTo(entries[entries.length - 1].id, 'none');
      }
    })();

  </script>
</body>
</html>
