fix(web): Fix file inline comment focus and persistence - #8662

Note

Medium Risk
File comment state now flows through the composer draft store and Pierre remap sync, so incorrect add/remove/restore logic could lose or duplicate review comments.

Overview
Fixes inline file comments so the draft field focuses reliably in the Pierre editor, the caret stays visible, and submitted comments survive leaving and returning to a file tab—matching diff review behavior.

DiffCommentAnnotation adds optional focusOnMount (default on) and focuses the draft textarea in a layout effect via requestAnimationFrame with preventScroll, instead of relying on autoFocus alone. Draft styling now sets caret-foreground so the cursor is visible on file surfaces.

EditableFileSurface no longer keeps all annotations in local state. Persisted comments come from the composer draft store’s reviewComments (rebuilt with buildFileCommentAnnotations); only the in-progress draft stays local. Pierre remap events sync the store through resolveFileCommentAnnotationChanges, with a restorable-ID set so transient Pierre removals don’t drop comments incorrectly. Starting a comment blurs the editor and clears selections; submit/cancel flows write through the store.

New helpers and tests live in fileCommentAnnotations.ts and FilePreviewPanel.test.ts.

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Note

Fix file inline comment focus and sync annotations to composer draft store

• Refactors EditableFileSurface to source line comment annotations from persisted reviewComments in the composer draft store instead of local state; opening a comment creates a local draft, submitting persists a ReviewComment, and removing an annotation removes it from the store
• Adds buildFileCommentAnnotations, appendFileCommentEntry, and resolveFileCommentAnnotationChanges utilities in fileCommentAnnotations.ts to derive renderable annotations from store state and detect added/removed comment IDs across renders
• Comments pruned from editor annotations are removed from the store and temporarily held in restorableCommentIdsRef for same-session restoration
• DiffCommentAnnotation now only programmatically focuses the textarea for draft comments on the next animation frame with preventScroll, and focus can be disabled via the new focusOnMount prop
• Risk: annotation persistence now depends on the composer draft store; any code reading the old local lineAnnotations state or expecting autoFocus on all comment kinds will need to use the new store-backed flow

^{Macroscope summarized ea19cf8.}