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/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"