SD-2277 - fix: tracked change doesn't undo correctly

[chittolinag]

Issue

Tracked-change bubbles weren’t updated when the history replay rebuilt suggestions, so undoing part of an insertion (typing “add text” → undoing “ text”) removed those characters from the document but left the sidebar bubble showing “add text.”

Fix

This fix makes syncTrackedChangeComments() re-run createOrUpdateTrackedChangeComment() in “update” mode for existing suggestions, making sure that replay re-calculates the tracked-change text/deletion payload from the current state before emitting the bubble update.

The fix keeps full metadata per tracked-change ID (runtime ID + imported ID) and adds a refreshExisting mode. When replay runs, the helper now:

1. Collects existing unresolved tracked-change comments and memoizes them by ID.
2. When we find a grouped change whose ID already exists, we let it through and call createOrUpdateTrackedChangeComment() with event: 'update'.
3. The update path re-extracts insertion/deletion text directly from the doc and emits the updated payload via handleTrackedChangeUpdate().

[linear]

SD-2277 BUG: Tracked change text becomes inaccurate after undo/redo within TC bubble

[caio-pizzol]

@chittolinag looks good! tested locally — undo/redo updates the sidebar bubble correctly now. one small cleanup inline.

[caio-pizzol]

@chittolinag lgtm! added a test for the bubble text after undo/redo, all green.

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