feat(rallocator_cli): scroll long stack frames instead of wrapping

[martintmk]

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After:

[Copilot]

Pull request overview

This PR updates the rallocator_cli HTML snapshot template styling so long stack-frame lines scroll horizontally instead of wrapping, improving readability of stack traces in generated reports.

Changes:

• Switch .stack rendering from wrap-anywhere to horizontal scrolling (overflow-x: auto) and prevent per-frame wrapping (white-space: nowrap).
• Add thin/custom scrollbar styling for .stack (Firefox scrollbar-* and WebKit pseudo-elements).
• Ensure grid children in .hotspot-stacks can shrink (min-width: 0) to avoid overflow issues.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (a650c15) to head (400db8a).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #667   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files         503      503           
  Lines       57407    57407           
=======================================
  Hits        57407    57407           

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

Suppressed comments (1)

justfiles/anvil/checks/doc-test.just:25

• cargo metadata is being invoked without --locked, which can allow Cargo to update Cargo.lock (or otherwise resolve outside the locked set) before the subsequent cargo test --doc --locked runs. Other repository scripts use cargo metadata ... --locked to keep the workspace state deterministic (e.g. justfiles/extended.just:27). Consider adding --locked here as well.

        $meta = cargo metadata --no-deps --format-version 1 | ConvertFrom-Json

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.