Add log out button

lib/rooms.dart

@@ -1,6 +1,8 @@
 import 'package:flutter/material.dart';
 import 'package:matrix/matrix.dart';
 import 'package:provider/provider.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import 'package:zenith/login.dart';
 import 'package:zenith/room.dart';
 import 'package:zenith/zenith_client_provider.dart';
 
@@ -30,6 +32,48 @@ class _RoomsPageState extends State<RoomsPage> {
       appBar: AppBar(
         backgroundColor: Theme.of(context).colorScheme.inversePrimary,
         title: const Text("Zenith"),
+        actions: [
+          IconButton(
+              onPressed: () {
+                showDialog(
+                  context: context,
+                  builder: (context) => AlertDialog(
+                    title: const Text("Log out?"),
+                    actions: [
+                      ElevatedButton(
+                          onPressed: () {
+                            Navigator.of(context).pop();
+                          },
+                          child: const Text("Cancel")),
+                      ElevatedButton(
+                        child: const Text("Confirm"),
+                        onPressed: () async {
+                          print("Logging out...");
+                          final prefs = await SharedPreferences.getInstance();
+                          prefs.remove("homeserver");
+                          prefs.remove("username");
+                          prefs.remove("password");
+
+                          if (!mounted) return;
+                          final provider = Provider.of<ZenithClientProvider>(
+                              context,
+                              listen: false);
+                          await provider.client.logout();
+
+                          if (!mounted) return;
+                          Navigator.pushAndRemoveUntil(
+                              context,
+                              MaterialPageRoute(
+                                  builder: (context) => const LoginPage()),
+                              (route) => false);
+                        },
+                      )
+                    ],
+                  ),
+                );
+              },
+              icon: const Icon(Icons.logout))
+        ],
       ),
       body: Padding(
         padding: const EdgeInsets.all(16.0),