Admin: stats privacy toggle, clickable event rows, fix payment method display

- Add useStatsPrivacy hook with localStorage persistence for stats visibility
- Single event page: desktop privacy button, hide capacity chip when stats hidden
- Events list: row/card click navigates to event detail; stopPropagation on actions
- Backend GET /tickets: include payment for each ticket (removes N+1)
- Bookings page: use list payment data, show — when payment method unknown

Made-with: Cursor

frontend/src/hooks/useStatsPrivacy.ts

@@ -0,0 +1,41 @@
+'use client';
+
+import { useState, useEffect, useCallback } from 'react';
+
+const STORAGE_KEY = 'spanglish-admin-stats-hidden';
+
+export function useStatsPrivacy() {
+  const [showStats, setShowStatsState] = useState(true);
+
+  useEffect(() => {
+    if (typeof window === 'undefined') return;
+    try {
+      const stored = localStorage.getItem(STORAGE_KEY);
+      if (stored !== null) {
+        setShowStatsState(stored !== 'true');
+      }
+    } catch {
+      // ignore
+    }
+  }, []);
+
+  const setShowStats = useCallback((value: boolean | ((prev: boolean) => boolean)) => {
+    setShowStatsState((prev) => {
+      const next = typeof value === 'function' ? value(prev) : value;
+      try {
+        if (typeof window !== 'undefined') {
+          localStorage.setItem(STORAGE_KEY, String(!next));
+        }
+      } catch {
+        // ignore
+      }
+      return next;
+    });
+  }, []);
+
+  const toggleStats = useCallback(() => {
+    setShowStats((prev) => !prev);
+  }, [setShowStats]);
+
+  return [showStats, setShowStats, toggleStats] as const;
+}