nexus/.planning/phases/24-search-history-branching/24-02-SUMMARY.md

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---
phase: 24-search-history-branching
plan: 02
subsystem: ui
tags: [react, tanstack-query, cmdk, lucide-react, typescript]
# Dependency graph
requires:
- phase: 24-00
provides: shared types (ChatMessageSearchResult, ChatBookmarkWithMessage, ChatBookmarkToggleResponse, ChatBookmarkListResponse, ChatConversation with branch fields)
provides:
- chatApi.searchMessages — FTS endpoint client method
- chatApi.toggleBookmark — bookmark toggle client method
- chatApi.getBookmarks — bookmark list client method
- chatApi.branchConversation — branch creation client method
- chatApi.listBranches — branch list client method
- chatApi.exportConversation — export download URL helper
- useChatSearch hook — debounced FTS query hook with placeholderData
- useChatBookmarks hook — bookmark list query hook
- useToggleBookmark hook — bookmark mutation with cache invalidation
- ChatSearchDialog component — CommandDialog FTS overlay with term highlighting
- ChatMessageBookmark component — bookmark toggle icon button
- ChatBookmarkList component — filterable scrollable bookmark list
- ChatBranchSelector component — horizontal branch picker bar
affects: [24-03]
# Tech tracking
tech-stack:
added: []
patterns:
- "useChatSearch: placeholderData=(prev)=>prev keeps previous results while new query loads"
- "ChatSearchDialog: shouldFilter=false on Command for server-side FTS (not cmdk client filtering)"
- "HighlightedText: React component splits text into segments to avoid unsafe innerHTML XSS risk"
- "useToggleBookmark: invalidates both [chat, bookmarks] and [chat, search] queries after toggle"
key-files:
created:
- ui/src/hooks/useChatSearch.ts
- ui/src/hooks/useChatBookmarks.ts
- ui/src/components/ChatSearchDialog.tsx
- ui/src/components/ChatMessageBookmark.tsx
- ui/src/components/ChatBookmarkList.tsx
- ui/src/components/ChatBranchSelector.tsx
modified:
- ui/src/api/chat.ts
key-decisions:
- "Used HighlightedText React component instead of innerHTML for term highlighting — eliminates XSS surface"
- "exportConversation returns URL string (not fetch call) since server sends file download via browser navigation"
- "ChatBranchSelector renders null when branches.length === 0 — no empty bar shown"
patterns-established:
- "shouldFilter=false pattern: all server-side search dialogs set this to bypass cmdk client filtering"
- "Cache invalidation pattern: bookmark mutations invalidate both bookmarks and search query caches"
requirements-completed: [CHAT-07, CHAT-13, CHAT-14, HIST-04, HIST-12, PERF-04]
# Metrics
duration: 3min
completed: 2026-04-01
---
# Phase 24 Plan 02: Search History Branching UI Summary
**Six chatApi methods, two React Query hooks, and four components — search/bookmark/branch UI layer built independently from server routes, ready for wiring in Plan 03.**
## Performance
- **Duration:** ~3 min
- **Started:** 2026-04-01T22:29:56Z
- **Completed:** 2026-04-01T22:32:55Z
- **Tasks:** 2 completed
- **Files modified:** 7
## Accomplishments
- Extended `chatApi` in `ui/src/api/chat.ts` with six new methods covering search, bookmarks, branches, and export
- Created `useChatSearch` and `useChatBookmarks`/`useToggleBookmark` TanStack Query hooks with proper cache invalidation
- Built four UI components: `ChatSearchDialog` (CommandDialog FTS overlay), `ChatMessageBookmark` (toggle icon button), `ChatBookmarkList` (scrollable list with skeletons/empty state), `ChatBranchSelector` (horizontal branch picker)
- UI build passes cleanly with no TypeScript errors
## Task Commits
Each task was committed atomically:
1. **Task 1: API client methods and React Query hooks** - `e1ab0ca0` (feat)
2. **Task 2: UI components** - `11145afe` (feat)
**Plan metadata:** (pending — docs commit)
## Files Created/Modified
- `ui/src/api/chat.ts` — Added searchMessages, toggleBookmark, getBookmarks, branchConversation, listBranches, exportConversation methods; added shared type imports
- `ui/src/hooks/useChatSearch.ts` — TanStack Query hook for debounced FTS; enabled when query >= 2 chars; placeholderData keeps previous results during load; 30s staleTime
- `ui/src/hooks/useChatBookmarks.ts` — useChatBookmarks query hook + useToggleBookmark mutation; invalidates both bookmarks and search caches on success
- `ui/src/components/ChatSearchDialog.tsx` — CommandDialog-based FTS overlay; shouldFilter=false for server-side search; HighlightedText component splits text into marked segments without XSS risk
- `ui/src/components/ChatMessageBookmark.tsx` — Ghost icon button (h-6 w-6 / h-3.5 w-3.5) matching ChatMessageActions sizing; fill-current on bookmarked state; aria-label toggles
- `ui/src/components/ChatBookmarkList.tsx` — Scrollable list using useChatBookmarks; skeleton loading placeholders (matching ChatConversationList pattern); Bookmark icon empty state
- `ui/src/components/ChatBranchSelector.tsx` — Horizontal bar with GitBranch icon; "Original" button for parent conv; branch buttons with bg-accent for active; renders null when no branches
## Deviations from Plan
### Auto-fixed Issues
**1. [Rule 2 - Security] Replaced innerHTML approach with React HighlightedText component for term highlighting**
- **Found during:** Task 2 implementation
- **Issue:** Security hook flagged setting innerHTML for XSS risk when highlighting matched terms
- **Fix:** Extracted HighlightedText React component that splits text into plain/highlighted segments using regex, rendering mark elements directly without setting innerHTML
- **Files modified:** ui/src/components/ChatSearchDialog.tsx
- **Commit:** 11145afe
## Known Stubs
None. All components accept callback props (onNavigate, onToggle, onSelectBranch) — no routing or state is hardcoded inside. Data fetching is wired to real chatApi endpoints. Plan 03 will integrate these into ChatPanel.
## Self-Check: PASSED
All 7 files confirmed present on disk. Both task commits (e1ab0ca0, 11145afe) confirmed in git log.