feat: add collapsible section for worst performance pages in PerformanceStats component

components/dashboard/PerformanceStats.tsx

@@ -1,6 +1,7 @@
 'use client'
 
 import { useState, useEffect } from 'react'
+import { ChevronDownIcon } from '@radix-ui/react-icons'
 import { PerformanceStats as Stats, PerformanceByPageStat, getPerformanceByPage } from '@/lib/api/stats'
 import Select from '@/components/ui/Select'
 
@@ -43,6 +44,7 @@ export default function PerformanceStats({ stats, performanceByPage, siteId, sta
   const [sortBy, setSortBy] = useState<'lcp' | 'cls' | 'inp'>('lcp')
   const [overrideRows, setOverrideRows] = useState<PerformanceByPageStat[] | null>(null)
   const [loadingTable, setLoadingTable] = useState(false)
+  const [worstPagesOpen, setWorstPagesOpen] = useState(false)
 
   // * When props.performanceByPage changes (e.g. date range), clear override so we use dashboard data
   useEffect(() => {
@@ -111,13 +113,24 @@ export default function PerformanceStats({ stats, performanceByPage, siteId, sta
         * Averages calculated from real user sessions. Lower is better.
       </div>
 
-      {/* * Performance by page (worst first) */}
+      {/* * Performance by page (worst first) – collapsed by default */}
       <div className="mt-6 pt-6 border-t border-neutral-200 dark:border-neutral-800">
         <div className="flex items-center justify-between gap-4 mb-3">
-          <h4 className="text-sm font-medium text-neutral-700 dark:text-neutral-300">
+          <button
+            type="button"
+            onClick={() => setWorstPagesOpen((o) => !o)}
+            className="flex items-center gap-2 text-left rounded cursor-pointer hover:opacity-80 focus:outline-none focus:ring-2 focus:ring-neutral-400 dark:focus:ring-neutral-500 focus:ring-offset-2 dark:focus:ring-offset-neutral-900"
+            aria-expanded={worstPagesOpen}
+          >
+            <ChevronDownIcon
+              className={`w-4 h-4 shrink-0 text-neutral-500 transition-transform ${worstPagesOpen ? '' : '-rotate-90'}`}
+              aria-hidden
+            />
+            <span className="text-sm font-medium text-neutral-700 dark:text-neutral-300">
               Worst pages by metric
-          </h4>
-          {canRefetch && (
+            </span>
+          </button>
+          {worstPagesOpen && canRefetch && (
             <Select
               value={sortBy}
               onChange={handleSortChange}
@@ -132,7 +145,8 @@ export default function PerformanceStats({ stats, performanceByPage, siteId, sta
             />
           )}
         </div>
-        {loadingTable ? (
+        {worstPagesOpen && (
+          loadingTable ? (
             <div className="py-8 text-center text-neutral-500 text-sm">Loading…</div>
           ) : rows.length === 0 ? (
             <div className="py-6 text-center text-neutral-500 text-sm">
@@ -171,6 +185,7 @@ export default function PerformanceStats({ stats, performanceByPage, siteId, sta
                 </tbody>
               </table>
             </div>
+          )
         )}
       </div>
     </div>