Add product pagination and enable BestBuy

Implement client-side pagination for the products grid: add PRODUCTS_PER_PAGE, currentProductPage, offset in /products requests, renderPagination(), and changeProductPage() (with smooth scroll). Reset page when filters or event filters change and render empty-state pagination. Add pagination container to the template and styles for pagination buttons and info. Also enable "bestbuy" in SITES_ENABLED in config.py and add a taskkill line to .claude/settings.local.json for closing stray python.exe processes.

dashboard/static/style.css

@@ -859,6 +859,42 @@ h3 {
   background: var(--border-color);
 }
 
+/* Pagination */
+#productsPagination {
+  margin-top: 20px;
+}
+
+.pagination {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: 15px;
+}
+
+.btn-page {
+  padding: 8px 18px;
+  background: var(--bg-card);
+  color: var(--text-primary);
+  border: 1px solid var(--border-color);
+  border-radius: 6px;
+  cursor: pointer;
+  font-size: 14px;
+}
+
+.btn-page:hover:not(:disabled) {
+  background: var(--border-color);
+}
+
+.btn-page:disabled {
+  opacity: 0.4;
+  cursor: default;
+}
+
+.page-info {
+  color: var(--text-secondary);
+  font-size: 14px;
+}
+
 /* Settings */
 .settings-section {
   max-width: 600px;