feat(topbar): drop search box to reclaim filter-bar space

The search box on the right edge of the filter bar wasn't pulling its
weight — kills it entirely along with the supporting plumbing:

- FilterBar: remove input + Search icon import + local/debounced state
- filterStore: drop `q`, `setQ`, plus all references in INITIAL_FILTERS,
  filtersToParams, hasActiveFilters, snapshotFilters
- usePhotosQuery: stop passing q through filtersToParams
- useFilterUrlSync: drop the `q` URL param read/write
- PhotoThumbnail + PreviewView: remove the search-match banner/chip and
  findSearchMatch helper imports
- Timeline + MemoriesView: stop subscribing to / forwarding the prop
- useKeyboardShortcuts: drop the `/` and Cmd+F focus hotkeys
- KeyboardHints: drop the `/` hint and the now-stale `?` collision note
- delete hooks/useSearchQuery.ts (no callers) and lib/searchMatch.ts

Backend /photos/search endpoint left untouched — no UI reaches it now.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/hooks/useFilterUrlSync.ts

@@ -37,9 +37,6 @@ function parseUrl(): HydratePayload {
   const sp = new URLSearchParams(window.location.search)
   const out: HydratePayload = {}
 
-  const q = sp.get('q')
-  if (q) out.q = q
-
   const df = sp.get('date_from')
   if (df) out.dateFrom = df
 
@@ -112,7 +109,6 @@ function parseUrl(): HydratePayload {
 
 function writeUrl(f: FilterState & { currentSection?: string }) {
   const sp = new URLSearchParams()
-  if (f.q.trim()) sp.set('q', f.q.trim())
   if (f.dateFrom) sp.set('date_from', f.dateFrom)
   if (f.dateTo) sp.set('date_to', f.dateTo)
   if (f.mediaTypes.length > 0) sp.set('media_type', f.mediaTypes.join(','))

frontend/src/hooks/useKeyboardShortcuts.ts

@@ -403,15 +403,6 @@ export function useKeyboardShortcuts(props: KeyboardShortcutsProps) {
     HK_OPTS
   )
 
-  // Search focus (/ or Cmd/Ctrl+F).
-  const focusSearch = () => {
-    const el = document.getElementById('topbar-search') as HTMLInputElement | null
-    el?.focus()
-    el?.select()
-  }
-  useHotkeys('/', focusSearch, HK_OPTS)
-  useHotkeys('mod+f', focusSearch, HK_OPTS)
-
   // Space toggles the preview view (open from grid, close from preview).
   // Double-click on a thumbnail does the same.
   const openPreviewFromGrid = () => {

frontend/src/hooks/usePhotosQuery.ts

@@ -49,7 +49,6 @@ export function usePhotosQuery() {
   const filterParams = useFilterStore(
     useShallow((s) =>
       filtersToParams({
-        q: s.q,
         dateFrom: s.dateFrom,
         dateTo: s.dateTo,
         mediaTypes: s.mediaTypes,

frontend/src/hooks/useSearchQuery.ts

@@ -1,37 +0,0 @@
-import { useQuery } from '@tanstack/react-query'
-import { search, type SearchResult } from '../services/api'
-import { useFilterStore } from '../store/filterStore'
-
-/**
- * Hybrid search hook — fires POST /photos/search when the user has a
- * non-empty search query. Returns results ranked by RRF (FTS + semantic).
- *
- * When `q` is empty, this hook is disabled and returns no data — the
- * normal usePhotosQuery takes over for browse mode.
- */
-export function useSearchQuery() {
-  const q = useFilterStore((s) => s.q)
-  const tagIds = useFilterStore((s) => s.tagIds)
-  const dateFrom = useFilterStore((s) => s.dateFrom)
-  const dateTo = useFilterStore((s) => s.dateTo)
-
-  const hasQuery = q.trim().length > 0
-
-  return useQuery<SearchResult[]>({
-    queryKey: ['search', q, tagIds, dateFrom, dateTo],
-    queryFn: async () => {
-      const resp = await search.query({
-        q: q.trim(),
-        filters: {
-          tag_ids: tagIds.length > 0 ? tagIds : undefined,
-          date_from: dateFrom ?? undefined,
-          date_to: dateTo ?? undefined,
-        },
-        limit: 200,
-      })
-      return resp.results
-    },
-    enabled: hasQuery,
-    staleTime: 30_000,
-  })
-}