feat(code-review): filter files with comments

[MattPua]

Summary

• add a review toolbar filter for files with PR comments
• preserve section headers and renamed-file path matching while filtering
• keep viewed counts and file navigation consistent with the visible review list

Testing

• pnpm --filter @posthog/ui exec vitest run src/features/code-review
• pnpm --filter @posthog/ui typecheck
• pnpm exec biome check packages/ui/src/features/code-review/components/CloudReviewPage.tsx packages/ui/src/features/code-review/components/ReviewPage.tsx packages/ui/src/features/code-review/components/ReviewShell.tsx packages/ui/src/features/code-review/components/ReviewToolbar.tsx packages/ui/src/features/code-review/components/reviewItemBuilders.tsx packages/ui/src/features/code-review/reviewShellParts.tsx packages/ui/src/features/code-review/reviewShellParts.test.tsx

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Created with PostHog Code

[trunk-io]

😎 Merged directly without going through the merge queue, as the queue was empty and the PR was up to date with the target branch - details.

[github-actions]

React Doctor found 1 issue in 1 file · 1 warning.

1 warning

src/features/code-review/components/ReviewShell.tsx

• ⚠️ src/features/code-review/components/ReviewShell.tsx:120 Large component is hard to read and change no-giant-component

_{Reviewed by React Doctor for commit 0cae5d3.}

[greptile-apps]

Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

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### Issue 1 of 1
packages/ui/src/features/code-review/components/ReviewShell.tsx:148-150
**Empty Data Reactivates Saved Filter**

When a PR URL or source becomes available again while `showCommentedFilesOnly` remains true, `commentedFilePaths` is initially an empty set while comments load. The filter therefore activates immediately and briefly replaces the review with “No files with comments,” even though the comment data is still pending; the active state should distinguish loading from a loaded empty result.

_{Reviews (1): Last reviewed commit: "feat(code-review): filter files with com..." | Re-trigger Greptile}

[posthog]

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