feat(app): v2 review panel overhaul

[arvsrn]

Issue for this PR

N/A

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

• Adds the complete v2 review panel, with new UI and functionality
• Duplicates some v1 components to ensure no changes affect v1
• Tabs logic is copied from my other unmerged PR (#31364), can dedup once that lands
• Filter logic needs deliberate review: I added a fallback path because the primary path was unreliable
• Changes the filter view to show a flat list of files
• Adds a resizable file sidebar

How did you verify your code works?

• Ran the app locally and verified the updated UI manually
• Ran type checks locally (bun turbo typecheck)
• Ran v1 locally to confirm no changes affect v1

Screenshots / recordings

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

If you do not follow this template your PR will be automatically rejected.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Related PR Found

I found one PR that is directly related to the current PR #31882:

PR #31364: feat(app): draggable tabs

• feat(app): draggable tabs #31364
• Relationship: The PR description explicitly mentions that tabs logic is copied from this PR and can be deduped once it lands. This is not a duplicate but a acknowledged dependency for future cleanup.

The search results show that PR #31882 (the current PR) appears to be unique in its focus on the v2 review panel overhaul with the specific features mentioned (flat file list view, resizable sidebar, filter logic improvements).

No duplicate PRs found for the core functionality of this PR.