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/.

server/tests/integration/places.test.ts

@@ -771,7 +771,7 @@ describe('KML/KMZ Import', () => {
     expect(res.body.summary.totalPlacemarks).toBe(3);
     expect(res.body.summary.skippedCount).toBe(1);
     expect(Array.isArray(res.body.summary.errors)).toBe(true);
-    expect(res.body.summary.errors.join(' ')).toContain('missing Point coordinates');
+    expect(res.body.summary.errors.join(' ')).toContain('unsupported geometry type');
 
     const nested = res.body.places.find((p: any) => p.name === 'Nested Place');
     expect(nested).toBeDefined();
@@ -862,7 +862,7 @@ describe('GPX Import — edge cases', () => {
       .set('Cookie', authCookie(user.id))
       .attach('file', emptyGpx, { filename: 'empty.gpx', contentType: 'application/gpx+xml' });
     expect(res.status).toBe(400);
-    expect(res.body.error).toMatch(/no waypoints/i);
+    expect(res.body.error).toMatch(/no matching places/i);
   });
 });