feat: add onQueryChange prop and serverFiltered flag to CommandPalette

Enables server-side exchange search from the command palette. Server-filtered
results skip client-side text matching since they matched on content not
visible in title/meta.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/design-system/composites/CommandPalette/CommandPalette.tsx

@@ -12,6 +12,7 @@ interface CommandPaletteProps {
   onSelect: (result: SearchResult) => void
   data: SearchResult[]
   onOpen?: () => void
+  onQueryChange?: (query: string) => void
 }
 
 const CATEGORY_LABELS: Record<SearchCategory | 'all', string> = {
@@ -60,7 +61,7 @@ function highlightText(text: string, query: string, matchRanges?: [number, numbe
   return <>{parts}</>
 }
 
-export function CommandPalette({ open, onClose, onSelect, data, onOpen }: CommandPaletteProps) {
+export function CommandPalette({ open, onClose, onSelect, data, onOpen, onQueryChange }: CommandPaletteProps) {
   const [query, setQuery] = useState('')
   const [activeCategory, setActiveCategory] = useState<SearchCategory | 'all'>('all')
   const [scopeFilters, setScopeFilters] = useState<ScopeFilter[]>([])
@@ -102,7 +103,7 @@ export function CommandPalette({ open, onClose, onSelect, data, onOpen }: Comman
     if (query.trim()) {
       const q = query.toLowerCase()
       results = results.filter(
-        (r) => r.title.toLowerCase().includes(q) || r.meta.toLowerCase().includes(q),
+        (r) => r.serverFiltered || r.title.toLowerCase().includes(q) || r.meta.toLowerCase().includes(q),
       )
     }
 
@@ -208,6 +209,7 @@ export function CommandPalette({ open, onClose, onSelect, data, onOpen }: Comman
             onChange={(e) => {
               setQuery(e.target.value)
               setFocusedIdx(0)
+              onQueryChange?.(e.target.value)
             }}
             aria-label="Search"
           />

src/design-system/composites/CommandPalette/types.ts

@@ -13,6 +13,8 @@ export interface SearchResult {
   path?: string
   expandedContent?: string
   matchRanges?: [number, number][]
+  /** Skip client-side query filtering (result already matched server-side) */
+  serverFiltered?: boolean
 }
 
 export interface ScopeFilter {