feat: persist server settings

lib/features/connection/login_screen.dart

@@ -18,12 +18,6 @@ class _LoginScreenState extends ConsumerState<LoginScreen> {
   bool _loading = false;
   String? _error;
 
-  @override
-  void initState() {
-    super.initState();
-    _tryAutoLogin();
-  }
-
   @override
   void dispose() {
     _usernameController.dispose();
@@ -31,18 +25,7 @@ class _LoginScreenState extends ConsumerState<LoginScreen> {
     super.dispose();
   }
 
-  Future<void> _tryAutoLogin() async {
-    final store = ref.read(credentialStoreProvider);
-    final saved = await store.load();
-    if (saved == null || !mounted) return;
-
-    _usernameController.text = saved.username;
-    _passwordController.text = saved.password;
-    await _login(saved.username, saved.password, saveCredentials: false);
-  }
-
-  Future<void> _login(String username, String password,
-      {bool saveCredentials = true}) async {
+  Future<void> _login(String username, String password) async {
     setState(() {
       _loading = true;
       _error = null;
@@ -59,11 +42,9 @@ class _LoginScreenState extends ConsumerState<LoginScreen> {
       await realtime.connect();
       ref.read(realtimeDataClientProvider.notifier).state = realtime;
 
-      if (saveCredentials) {
-        await ref
-            .read(credentialStoreProvider)
-            .save((username: username, password: password));
-      }
+      await ref
+          .read(credentialStoreProvider)
+          .save((username: username, password: password));
 
       if (mounted) context.go('/floorplan');
     } on Exception catch (e) {