fix: Add missing handleEditGuestbookEntry and handleSaveEditGuestbook functions

- Define handleEditGuestbookEntry to open edit dialog with entry data
- Define handleSaveEditGuestbook to save guestbook entry changes
- Fixes ReferenceError: handleSaveEditGuestbook is not defined

These functions were referenced in the UI but not defined in the component scope

src/components/features/admin/admin-dashboard.tsx

@@ -2332,6 +2332,79 @@ export function AdminDashboard({
     setDeleteGuestbookDialog({ open: true, messageId });
   };
 
+  const handleEditGuestbookEntry = (entry: any) => {
+    setEditingGuestbookEntry(entry);
+    setEditGuestbookForm({
+      message: entry.message || '',
+      photo: entry.photo || '',
+      audioUrl: entry.audioUrl || '',
+      videoUrl: entry.videoUrl || '',
+    });
+    setIsEditGuestbookOpen(true);
+  };
+
+  const handleSaveEditGuestbook = async () => {
+    if (!editingGuestbookEntry) return;
+
+    const csrfToken = await getCSRFToken();
+    if (!csrfToken) {
+      toast({
+        variant: "error",
+        title: "Authentication Required",
+        description: "Please refresh the page.",
+      });
+      return;
+    }
+
+    try {
+      const response = await fetch('/api/admin/guestbook', {
+        method: 'PUT',
+        credentials: 'include',
+        headers: {
+          'Content-Type': 'application/json',
+          'x-csrf-token': csrfToken,
+        },
+        body: JSON.stringify({
+          id: editingGuestbookEntry.id,
+          message: editGuestbookForm.message.trim(),
+          photo: editGuestbookForm.photo || null,
+          audioUrl: editGuestbookForm.audioUrl || null,
+          videoUrl: editGuestbookForm.videoUrl || null,
+        }),
+      });
+
+      if (!response.ok) {
+        const errorData = await response.json();
+        throw new Error(errorData.error || 'Failed to update guestbook entry');
+      }
+
+      // Refresh guestbook entries
+      const refreshResponse = await fetch('/api/admin/guestbook', {
+        credentials: 'include',
+      });
+      if (refreshResponse.ok) {
+        const data = await refreshResponse.json();
+        setGuestbookEntries(data);
+      }
+
+      toast({
+        variant: "success",
+        title: "Guestbook Entry Updated",
+        description: "The entry has been updated successfully.",
+      });
+
+      setIsEditGuestbookOpen(false);
+      setEditingGuestbookEntry(null);
+      setEditGuestbookForm({ message: '', photo: '', audioUrl: '', videoUrl: '' });
+    } catch (error) {
+      toast({
+        variant: "error",
+        title: "Failed to Update Entry",
+        description: error instanceof Error ? error.message : 'Unknown error',
+      });
+    }
+  };
+
   const confirmDeleteGuestbookMessage = async () => {
     const { messageId } = deleteGuestbookDialog;
     if (!messageId) return;