feat(auth): integrate SmartAuth for SMS code auto-fill and update localization strings

lib/frontend/screens/auth/code_confirmation_screen.dart

@@ -1,8 +1,10 @@
 import 'dart:async';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:komet/l10n/app_localizations.dart';
 import 'package:flutter/services.dart';
 import 'package:google_fonts/google_fonts.dart';
+import 'package:smart_auth/smart_auth.dart';
 import '../chats/chat_list_screen.dart';
 import 'password_2fa_screen.dart';
 import '../../../main.dart';
@@ -26,9 +28,11 @@ class _CodeConfirmationScreenState extends State<CodeConfirmationScreen>
     with TickerProviderStateMixin {
   final TextEditingController _codeController = TextEditingController();
   final FocusNode _focusNode = FocusNode();
+  final SmartAuth _smartAuth = SmartAuth.instance;
   int _timerSeconds = 30;
   Timer? _timer;
   Timer? _errorTimer;
+  bool _isListeningSmsConsent = false;
 
   String? _errorMessage;
   late AnimationController _shakeController;
@@ -41,6 +45,7 @@ class _CodeConfirmationScreenState extends State<CodeConfirmationScreen>
     WidgetsBinding.instance.addPostFrameCallback((_) {
       _focusNode.requestFocus();
     });
+    _startSmsCodeListener();
 
     _shakeController = AnimationController(
       vsync: this,
@@ -56,10 +61,63 @@ class _CodeConfirmationScreenState extends State<CodeConfirmationScreen>
     ]).animate(CurvedAnimation(parent: _shakeController, curve: Curves.linear));
   }
 
+  Future<void> _startSmsCodeListener() async {
+    if (defaultTargetPlatform != TargetPlatform.android) return;
+    if (_isListeningSmsConsent) return;
+
+    _isListeningSmsConsent = true;
+    final result = await _smartAuth.getSmsWithUserConsentApi(matcher: r'\d{6}');
+    _isListeningSmsConsent = false;
+
+    if (!mounted || !result.hasData) return;
+
+    final receivedCode = result.data?.code;
+    if (receivedCode == null || receivedCode.isEmpty) return;
+
+    _applyAutoFillCode(receivedCode);
+  }
+
+  Future<void> _restartSmsCodeListener() async {
+    if (defaultTargetPlatform != TargetPlatform.android) return;
+    await _smartAuth.removeUserConsentApiListener();
+    _isListeningSmsConsent = false;
+    await _startSmsCodeListener();
+  }
+
+  void _handleCodeChanged(String value) {
+    setState(() {
+      if (_errorMessage != null) {
+        _errorMessage = null;
+      }
+    });
+    if (value.length == 6) {
+      _verifyCode();
+    }
+  }
+
+  void _applyAutoFillCode(String rawCode) {
+    final digitsOnly = rawCode.replaceAll(RegExp(r'\D'), '');
+    if (digitsOnly.isEmpty) return;
+
+    final nextCode = digitsOnly.length <= 6
+        ? digitsOnly
+        : digitsOnly.substring(0, 6);
+
+    if (_codeController.text == nextCode) return;
+
+    _codeController.value = TextEditingValue(
+      text: nextCode,
+      selection: TextSelection.collapsed(offset: nextCode.length),
+    );
+
+    _handleCodeChanged(nextCode);
+  }
+
   @override
   void dispose() {
     _timer?.cancel();
     _errorTimer?.cancel();
+    unawaited(_smartAuth.removeUserConsentApiListener());
     _shakeController.dispose();
     _codeController.dispose();
     _focusNode.dispose();
@@ -92,6 +150,7 @@ class _CodeConfirmationScreenState extends State<CodeConfirmationScreen>
   void _resendCode() {
     if (_timerSeconds == 0) {
       _startTimer();
+      unawaited(_restartSmsCodeListener());
     }
   }
 
@@ -206,11 +265,7 @@ class _CodeConfirmationScreenState extends State<CodeConfirmationScreen>
                             FilteringTextInputFormatter.digitsOnly,
                             LengthLimitingTextInputFormatter(6),
                           ],
-                          onChanged: (value) {
-                            if (hasError) setState(() => _errorMessage = null);
-                            setState(() {});
-                            if (value.length == 6) _verifyCode();
-                          },
+                          onChanged: _handleCodeChanged,
                         ),
                       ),
                     ),

lib/frontend/screens/auth/login_screen.dart

@@ -795,15 +795,6 @@ class _LoginScreenState extends State<LoginScreen> {
                                         height: 1.4,
                                       ),
                                       children: [
-                                        TextSpan(
-                                          text: l10n.loginTermsIntro,
-                                          style: GoogleFonts.inter(
-                                            color: cs.onSurface,
-                                            fontSize: 14,
-                                            height: 1.4,
-                                            fontWeight: FontWeight.w400,
-                                          ),
-                                        ),
                                         TextSpan(
                                           text: l10n.loginTermsLink,
                                           style: GoogleFonts.inter(