feat(import): selective GPX/KML element import and performance improvements

Add type-selector UI in the file import modal letting users choose which
GPX elements (waypoints, routes, tracks) or KML/KMZ elements (points,
paths) to import. KML LineString placemarks are now imported as path
places with route_geometry.

Performance improvements:
- Extract MemoPlaceRow with React.memo and contentVisibility:auto to cut
  unnecessary re-renders in PlacesSidebar
- Add weatherQueue to cap concurrent weather fetches at 3
- Replace sequential per-place deletes with a single bulkDelete API call
  (new DELETE /places/bulk endpoint + deletePlacesMany service)
- Memoize atlas/photo/weather service calls to avoid redundant requests
- Add multi-select mode to PlacesSidebar for bulk operations

Add large GPX/KML/KMZ fixtures for integration/perf testing and two
profiler analysis scripts under scripts/.

client/src/repo/placeRepo.ts

@@ -84,4 +84,26 @@ export const placeRepo = {
     offlineDb.places.delete(Number(id))
     return result
   },
+
+  async deleteMany(tripId: number | string, ids: number[]): Promise<unknown> {
+    if (!navigator.onLine) {
+      await offlineDb.places.bulkDelete(ids)
+      for (const id of ids) {
+        const mutId = generateUUID()
+        await mutationQueue.enqueue({
+          id: mutId,
+          tripId: Number(tripId),
+          method: 'DELETE',
+          url: `/trips/${tripId}/places/${id}`,
+          body: undefined,
+          resource: 'places',
+          entityId: id,
+        })
+      }
+      return { deleted: ids, count: ids.length }
+    }
+    const result = await placesApi.bulkDelete(tripId, ids)
+    await offlineDb.places.bulkDelete(ids)
+    return result
+  },
 }