refactor: rename api-hooks.ts to apiHooks.ts for consistency

- Renamed api-hooks.ts to apiHooks.ts to follow camelCase convention
- Updated all 21 import statements across the codebase
- Maintains consistency with other non-component files (apiClient.tsx, useAuthReady.ts, etc.)
- Follows established naming pattern: PascalCase for components, camelCase for utilities/hooks

www/app/(app)/rooms/page.tsx

@@ -23,7 +23,7 @@ import {
   useRoomDelete,
   useZulipStreams,
   useZulipTopics,
-} from "../../lib/api-hooks";
+} from "../../lib/apiHooks";
 import { RoomList } from "./_components/RoomList";
 import { PaginationPage } from "../browse/_components/Pagination";