Feature: Add search filtering on Enter key

Users can now:
1. Type a query and press Enter (without selecting a suggestion) to filter posts on the map
2. When picking a post suggestion, it navigates AND filters by that post's title
3. When picking a city/place, it navigates but clears the filter

Changes:
- SmartSearchBar: Added onSearch prop, triggers on Enter with no active item
- MapView: Added handleSearch() to set searchQuery for filtering
- Posts are automatically filtered by usePostsEngine's matchesSearch()

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/components/Map/MapView.jsx

@@ -234,8 +234,17 @@ export default function MapView({
       essential: true
     });
 
-    // Clear search query after navigation
-    setSearchQuery("");
+    // If picking a post, filter by its title; otherwise clear search
+    if (item.type === 'post' && item.title) {
+      setSearchQuery(item.title);
+    } else {
+      setSearchQuery("");
+    }
+  };
+
+  const handleSearch = (query) => {
+    console.log('[MapView] Search/filter by:', query);
+    setSearchQuery(query);
   };
 
   const handleOpenCreate = () => {
@@ -449,6 +458,7 @@ export default function MapView({
             <SmartSearchBar
               placeholder="Search cities, places, posts..."
               onPick={handlePickSuggestion}
+              onSearch={handleSearch}
               onMySpot={handleFlyToMe}
               onPlaceTourWire={handleOpenCreate}
             />

src/components/Search/SmartSearchBar.jsx

@@ -52,12 +52,14 @@ function IconWaves(props) {
  * Props:
  * - placeholder
  * - onPick(item, { zoom, reason })  // call when user selects suggestion
+ * - onSearch(query)                 // call when user presses Enter to filter/search
  * - onMySpot()                      // keep same function (center on user)
  * - onPlaceTourWire()               // keep same function (place/tour/wire)
  */
 export default function SmartSearchBar({
   placeholder = "Search places, regions, posts…",
   onPick,
+  onSearch,
   onMySpot,
   onPlaceTourWire,
 }) {
@@ -144,9 +146,14 @@ export default function SmartSearchBar({
       e.preventDefault();
       setActive((i) => Math.max(i - 1, 0));
     } else if (e.key === "Enter") {
+      e.preventDefault();
       if (items.length && active >= 0) {
-        e.preventDefault();
+        // Pick the selected suggestion
         pick(items[active], "enter");
+      } else if (q.trim()) {
+        // No item selected, trigger search/filter
+        setOpen(false);
+        onSearch && onSearch(q.trim());
       }
     } else if (e.key === "Escape") {
       setOpen(false);