fix: Guard EventEditorPage state initialization with loadedEventIdRef and key prop to prevent values resetting to defaults on edit

frontend/src/App.jsx

@@ -490,6 +490,7 @@ export default function App() {
           />
         ) : activeTab === 'event-editor' ? (
           <EventEditorPage
+            key={eventToEdit?.id || 'new-event'}
             eventToEdit={eventToEdit}
             skills={skills}
             user={user}