Refactor feedback-panel.tsx: extract detail panel and finding row

[selfcontained]

Summary

• Extracted FeedbackDetailPanel (~230 lines) into feedback-detail-panel.tsx — the feedback detail view with navigation, actions, and content rendering is now a self-contained module.
• Extracted FeedbackFindingRow (~90 lines) into feedback-finding-row.tsx — the per-finding row rendering (severity dot, file path, status icon, round dividers) is now a focused component.
• feedback-panel.tsx drops from 660 → 327 lines. Re-exports preserved so no consumer changes needed.

New file structure

feedback-panel.tsx          327 lines  (was 660)  — ParentFeedbackPanel + re-exports
feedback-detail-panel.tsx   253 lines  (new)      — FeedbackDetailPanel
feedback-finding-row.tsx     94 lines  (new)      — FeedbackFindingRow

Next up

media-sidebar.tsx (629 lines) — extract media item renderers, pin display, and media list into subcomponents.

Test plan

• pnpm run finalize:web — type check + production build passes
• pnpm run test:e2e — all 172 tests pass
• No behavior change — purely structural refactoring with re-exports for backwards compatibility

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