fix(rooms): "Rename for me" names in Ctrl+K, forward/share pickers and notifications (#336)

The personal room name (io.lotus.room_names) was only used by the
sidebar, header, intro and call bar; the quick switcher couldn't find a
room by it ("No match found") and showed the server name, as did the
forward/share pickers, toasts, OS notifications and reminders.

useRoomMeta gains useLocalRoomNames() / getLocalRoomName(); the quick
switcher matches both names and shows the personal one, the forward and
share pickers show and filter by it, and message/reminder notifications
use it for the room title.

Verified headless with general renamed to "Zebra Lounge": Ctrl+K "Zebra"
and "general" both list "Zebra Lounge"; the forward picker filtered by
"zebra" lists "Zebra Lounge".

Not covered here (follow-up): message-search result headers, the inbox
notifications page and the threads list still use the server name.

Refs #336

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5

src/app/hooks/useRoomMeta.ts

@@ -102,6 +102,22 @@ export const useLocalRoomName = (room: Room): string => {
   return localNames[room.roomId] ?? name;
 };
 
+/**
+ * [Gitea #336] The whole "Rename for me" map, for lists that show many rooms
+ * (quick switcher, forward/share pickers) so they use the name the user sees in
+ * the sidebar, not the server name.
+ */
+export const useLocalRoomNames = (): Readonly<Record<string, string>> => {
+  const mx = useMatrixClient();
+  return roomNamesStore.useValue(mx);
+};
+
+/** Non-hook read for notification paths (toast / OS notification titles). */
+export const getLocalRoomName = (
+  mx: ReturnType<typeof useMatrixClient>,
+  roomId: string,
+): string | undefined => roomNamesStore.getLatest(mx)[roomId];
+
 export const useHasLocalRoomName = (roomId: string): boolean => {
   const mx = useMatrixClient();
   const localNames = roomNamesStore.useValue(mx);