feat: rooms list with real Matrix data, MXC avatars and unread badges

lib/features/rooms/rooms_page.dart

@@ -1,12 +1,55 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:go_router/go_router.dart';
+import 'package:pyramid/features/rooms/room_list_item.dart';
+import 'package:pyramid/features/rooms/rooms_provider.dart';
 
-class RoomsPage extends StatelessWidget {
+class RoomsPage extends ConsumerWidget {
   const RoomsPage({super.key});
 
   @override
-  Widget build(BuildContext context) {
-    return const Scaffold(
-      body: Center(child: Text('Rooms')),
+  Widget build(BuildContext context, WidgetRef ref) {
+    final roomsAsync = ref.watch(roomListProvider);
+
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Pyramid'),
+        actions: [
+          IconButton(
+            icon: const Icon(Icons.settings_outlined),
+            onPressed: () => context.go('/settings'),
+          ),
+        ],
+      ),
+      body: roomsAsync.when(
+        loading: () => const Center(child: CircularProgressIndicator()),
+        error: (e, _) => Center(child: Text('Fehler: $e')),
+        data: (rooms) {
+          if (rooms.isEmpty) {
+            return const Center(
+              child: Column(
+                mainAxisSize: MainAxisSize.min,
+                children: [
+                  Icon(Icons.forum_outlined, size: 64),
+                  SizedBox(height: 16),
+                  Text('Noch keine Räume'),
+                ],
+              ),
+            );
+          }
+          return ListView.separated(
+            itemCount: rooms.length,
+            separatorBuilder: (context, i) => const Divider(height: 1, indent: 72),
+            itemBuilder: (context, i) {
+              final room = rooms[i];
+              return RoomListItem(
+                room: room,
+                onTap: () => context.go('/chat/${Uri.encodeComponent(room.id)}'),
+              );
+            },
+          );
+        },
+      ),
     );
   }
 }