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Charis
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## Summary This is **PR 3 of 3** in the FE-4243 stack fixing "Notebook update proposal shows 'unapplyable' error for already-completed updates." - Consumes the `previous_content` field added by PR 2 (#49401) to reconstruct diffs for already-applied notebook updates - Restores the diff preview that PR 1 initially dropped — completed updates now show the full before/after instead of a generic "Notebook updated" message - Uses the same diff derivation function called pre-approval, guaranteeing the rendered diff matches what was shown during confirmation - Includes defensive fallback handling for older persisted chats (before `previous_content` existed) and edge cases **Depends on**: PR 2 (#49401) merging first — this PR consumes the `previous_content` field from that server change. Resolves FE-4243 ## Test plan - ✅ 19/19 tests pass in NotebookProposalRenderer.test.tsx (2 confirmed as real regressions) - ✅ 118/118 tests pass in full AIAssistantPanel suite - ✅ Typecheck: clean on modified files - ✅ ESLint: zero errors/warnings on changed files - ✅ Lint ratchet: passes (some rules improved) - ✅ New regression tests cover: delete_cell, insert_cell, missing previous_content, and operations that no longer reconcile - ✅ No notebook fetch in completed update tests (proves no redundant re-fetching) <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Added visual previews showing notebook changes, including inserted and deleted cells, when prior content is available. * Prevented duplicate cells from appearing in update previews. * Retained a compact completion message when change details are unavailable or inconsistent. * Ensured previews are shown only for the relevant notebook. * **Tests** * Added coverage for notebook update previews, deletion and insertion diffs, duplicate prevention, notebook matching, and fallback behavior. <!-- end of auto-generated comment: release notes by coderabbit.ai -->