feat(catalog): hide per-level category filter on vehicle page

The new cross-tree catalog search sits directly above the top-level grid on
the vehicle page, so the grid's own "Kategori ara…" filter was a redundant
second search box. Add a hideFilter prop to CategoryGrid and set it there;
catalog-browse and deep category levels (no global search) keep the filter.

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

apps/web/src/routes/dashboard/vehicles_/$id/index.tsx

@@ -239,7 +239,7 @@ function VehicleDetailPage() {
                 ))}
               </div>
             ) : viewMode === "grid" ? (
-              <CategoryGrid categories={categoryTree || []} vehicleId={id} />
+              <CategoryGrid categories={categoryTree || []} vehicleId={id} hideFilter />
             ) : viewMode === "tree" ? (
               <CategoryTree categories={categoryTree || []} vehicleId={id} />
             ) : (