chore: remove AnnotatableFileDiff leftovers, rename file

[ipanasenko]

What Changed

Removed unused AnnotatableFileDiff component. Looks like it's a leftover after #3169
Renamed file AnnotatableFileDiff.tsx => AnnotatableCodeView.tsx

Why

Just cleaning things up a bit

UI Changes

None

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes - N/A
• I included a video for animation/interaction changes - N/A

Note

Remove AnnotatableFileDiff component and rename file to AnnotatableCodeView

Deletes the AnnotatableFileDiff component and its associated props interface from AnnotatableCodeView.tsx, removing the FileDiff-based rendering path along with its annotation state and handlers. Updates DiffPanel.tsx to import from the renamed module path.

^{Macroscope summarized e1ab551.}

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Note

Low Risk
Dead-code removal and import path rename with no remaining references to the removed component.

Overview
Cleanup after consolidating diff review UI on CodeView. The PR deletes the leftover AnnotatableFileDiff implementation (single-file FileDiff wrapper with its own annotation state) from what is now AnnotatableCodeView.tsx, and drops the unused FileDiff import from @pierre/diffs/react.

DiffPanel only changes the import path/handle type to ./diffs/AnnotatableCodeView; it already renders AnnotatableCodeView for multi-file diffs, so behavior should be unchanged.

^{Reviewed by Cursor Bugbot for commit e1ab551. Bugbot is set up for automated code reviews on this repo. Configure here.}

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[macroscopeapp]

Approvability

Verdict: Approved

Pure cleanup PR removing unused AnnotatableFileDiff component (confirmed no references in codebase) and renaming the file to match its actual export. No runtime behavior changes.

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