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a780cb6523
Harden commit diff loading/rendering so opening a very large commit no longer hangs the browser tab. Problem - commit history diff viewer rendered every diff line as a React node - very large commits could create thousands of nodes and lock the UI thread - backend always returned full commit patch payloads, amplifying frontend pressure Backend safeguards - add `COMMIT_DIFF_CHARACTER_LIMIT` (500,000 chars) in git routes - update GET `/api/git/commit-diff` to truncate oversized diff payloads - include `isTruncated` flag in response for observability/future UI handling - append truncation marker text when server-side limit is applied Frontend safeguards - update `GitDiffViewer` to use bounded preview rendering: - character cap: 200,000 - line cap: 1,500 - move diff preprocessing into `useMemo` for stable, one-pass preview computation - show a clear "Large diff preview" notice when truncation is active Impact - commit diff expansion remains responsive even for high-change commits - UI still shows useful diff content while avoiding tab lockups - changes apply to shared diff viewer usage and improve resilience broadly Validation - `node --check server/routes/git.js` - `npm run typecheck` - `npx eslint src/components/git-panel/view/shared/GitDiffViewer.tsx`