treewide(refactor): rename files to follow the same style

lib/controllers/pinned_ids.dart

@@ -0,0 +1,53 @@
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
+import "package:hooks_riverpod/hooks_riverpod.dart";
+import "package:nexus/controllers/client.dart";
+import "package:nexus/controllers/rooms.dart";
+import "package:nexus/models/content/content.dart";
+import "package:nexus/models/content/pinned_events.dart";
+
+class PinnedIdsController extends Notifier<IList<String>> {
+  final String roomId;
+  PinnedIdsController(this.roomId);
+
+  @override
+  IList<String> build() {
+    final room = ref.watch(
+      RoomsController.provider.select((rooms) => rooms[roomId]),
+    );
+
+    if (room == null) return .new();
+
+    final pinnedRowId = room.state[EventType.pinnedEvents.type]?[""];
+    final pinnedStateEvent = pinnedRowId == null
+        ? null
+        : room.events[pinnedRowId];
+
+    if (pinnedStateEvent?.content case PinnedEventsContent content) {
+      return content.pinnedEvents;
+    }
+
+    return .new();
+  }
+
+  Future<void> addPin(String eventId) async =>
+      setPinned(.new(pinnedEvents: .new(state.add(eventId))));
+
+  Future<void> removePin(String eventId) async =>
+      setPinned(.new(pinnedEvents: .new(state.remove(eventId))));
+
+  Future<void> setPinned(PinnedEventsContent content) => ref
+      .read(ClientController.provider.notifier)
+      .setState(
+        .new(
+          roomId: roomId,
+          type: EventType.pinnedEvents.type,
+          stateKey: "",
+          content: content,
+        ),
+      );
+
+  static final provider = NotifierProvider.family
+      .autoDispose<PinnedIdsController, IList<String>, String>(
+        PinnedIdsController.new,
+      );
+}