Fix credo quote-sigil warning in microprints_live_test.exs

Replace double-quoted string with escaped quotes in element selector
with a ~s sigil to satisfy Credo's 'More than 3 quotes found inside
string literal' readability check.

Includes formatting changes from mix format (ran via make check).

app/lib/firehose_web/live/microprints_live.ex

@@ -80,7 +80,8 @@ defmodule FirehoseWeb.MicroprintsLive do
                   highlighted_line={@highlighted_line}
                 />
 
-                <%= if @expanded_path == path and @source_lines do %>                  <.source_viewer
+                <%= if @expanded_path == path and @source_lines do %>
+                  <.source_viewer
                     source_lines={@source_lines}
                     highlighted_line={@highlighted_line}
                     language="elixir"
@@ -135,9 +136,12 @@ defmodule FirehoseWeb.MicroprintsLive do
 
     source_lines =
       case expanded do
-        nil -> nil
+        nil ->
+          nil
+
         ^path ->
           item = Enum.find(socket.assigns.microprints, &(&1.path == path))
+
           if item && item.source_dir do
             abs_path = resolve_source_path(item.source_dir, path)
             read_source(abs_path)
@@ -337,7 +341,12 @@ defmodule FirehoseWeb.MicroprintsLive do
   # Custom source_viewer with unique DOM IDs per file to prevent LiveView
   # DOM patching bugs when switching expanded files.
   def source_viewer(assigns) do
-    assigns = assign(assigns, :viewer_id, "source-viewer-" <> Integer.to_string(:erlang.phash2(assigns.file_path, 1_000_000)))
+    assigns =
+      assign(
+        assigns,
+        :viewer_id,
+        "source-viewer-" <> Integer.to_string(:erlang.phash2(assigns.file_path, 1_000_000))
+      )
 
     ~H"""
     <div
@@ -354,8 +363,8 @@ defmodule FirehoseWeb.MicroprintsLive do
             id={"line-#{num}"}
             class={"sv-line" <> if @highlighted_line == num, do: " sv-line-highlighted", else: ""}
           >
-            <span class="sv-line-number"><%= num %></span>
-            <span class="sv-line-content"><%= line %></span>
+            <span class="sv-line-number">{num}</span>
+            <span class="sv-line-content">{line}</span>
           </div>
         <% end %>
       </div>

app/test/firehose_web/live/microprints_live_test.exs

@@ -70,7 +70,9 @@ defmodule FirehoseWeb.MicroprintsLiveTest do
   end
 
   describe "expanded_path and highlighted_path coupling" do
-    test "expanding file A and highlighting a line in file B should collapse file A", %{conn: conn} do
+    test "expanding file A and highlighting a line in file B should collapse file A", %{
+      conn: conn
+    } do
       files = MicroprintsLive.scan_source_files()
       assert length(files) >= 2, "Need at least 2 files to test coupling"
 
@@ -90,16 +92,19 @@ defmodule FirehoseWeb.MicroprintsLiveTest do
 
       # Highlight a line in file B (rect elements inside SVG)
       view
-      |> element("svg rect[phx-value-line=\"1\"][phx-value-path=\"#{file_b}\"]")
+      |> element(~s(svg rect[phx-value-line="1"][phx-value-path="#{file_b}"]))
       |> render_click()
 
       # file A should be collapsed when highlighting a different file
       html = render(view)
+
       refute html =~ "Collapse",
              "file A should be collapsed after highlighting a different file, but the Collapse button is still visible (expanded_path is uncoupled from highlighted_path)"
     end
 
-    test "switching expand from file A to file B shows each file's own source content", %{conn: conn} do
+    test "switching expand from file A to file B shows each file's own source content", %{
+      conn: conn
+    } do
       files = MicroprintsLive.scan_source_files()
       assert length(files) >= 2, "Need at least 2 files to test source switching"
 
@@ -148,8 +153,10 @@ defmodule FirehoseWeb.MicroprintsLiveTest do
       {:ok, view, _html} = live(conn, ~p"/microprints?expanded=#{file_a}")
 
       html = render(view)
+
       assert html =~ "Collapse",
              "Expanded file should show Collapse button when restored from URL param"
+
       assert html =~ ~s(phx-value-path="#{file_a}")
     end
 
@@ -157,6 +164,7 @@ defmodule FirehoseWeb.MicroprintsLiveTest do
       {:ok, view, _html} = live(conn, ~p"/microprints?expanded=nonexistent.ex")
 
       html = render(view)
+
       refute html =~ "Collapse",
              "Nonexistent expanded path should not show Collapse"
     end
@@ -173,6 +181,7 @@ defmodule FirehoseWeb.MicroprintsLiveTest do
 
       # URL should contain expanded param after clicking Expand
       html = render(view)
+
       assert html =~ "Collapse",
              "File should remain expanded after push_patch updates URL"
     end

app/test/firehose_web/live/source_viewer_test.exs

@@ -25,8 +25,10 @@ defmodule FirehoseWeb.SourceViewerTest do
 
       assert has_element?(view, "#line-1"),
              "Line 1 should exist in the source viewer"
+
       assert has_element?(view, "#line-2"),
              "Line 2 should exist in the source viewer"
+
       assert has_element?(view, "#line-3"),
              "Line 3 should exist in the source viewer"
     end
@@ -54,10 +56,12 @@ defmodule FirehoseWeb.SourceViewerTest do
       expand_file(view, file)
 
       click_microprint_rect(view, file, 1)
+
       assert has_element?(view, "#line-1.sv-line-highlighted"),
              "Line 1 should be highlighted after first click"
 
       click_microprint_rect(view, file, 1)
+
       refute has_element?(view, "#line-1.sv-line-highlighted"),
              "Line 1 should no longer be highlighted after second click"
     end
@@ -66,7 +70,8 @@ defmodule FirehoseWeb.SourceViewerTest do
       files = MicroprintsLive.scan_source_files()
       file = List.first(files)
 
-      {:ok, view, _html} = live(conn, ~p"/microprints?expanded=#{file}&line=1&highlighted=#{file}")
+      {:ok, view, _html} =
+        live(conn, ~p"/microprints?expanded=#{file}&line=1&highlighted=#{file}")
 
       assert has_element?(view, "#line-1.sv-line-highlighted"),
              "Line 1 should be highlighted when restored from URL params"