feat(app): 完成 P0 钱包解锁、下载落盘与手机号登录

lib/pages/auth/auth_view.dart

@@ -13,6 +13,7 @@ import '../../core/theme/app_dimens.dart';
 import '../../core/theme/app_theme.dart';
 import '../../l10n/app_localizations.dart';
 import 'auth_logic.dart';
+import 'phone_auth_sheet.dart';
 
 part 'auth_widgets.dart';
 part 'auth_form_widgets.dart';
@@ -334,22 +335,13 @@ class _AuthPageState extends State<AuthPage> {
         style: const TextStyle(color: Color(0xFF9A96A3), fontSize: 11),
       ),
       const SizedBox(height: 22),
-      _AuthEntryButton(
-        key: const Key('auth-entry-google'),
-        label: 'G  ${l10n.authContinueGoogle}',
-        background: Colors.white,
-        foreground: const Color(0xFF1A1A1A),
-        leadingColor: const Color(0xFF4285F4),
-        onTap: () => _comingSoon(l10n),
-      ),
-      const SizedBox(height: 11),
       _AuthEntryButton(
         key: const Key('auth-entry-phone'),
         label: l10n.authPhoneSignIn,
         icon: Icons.phone_android_rounded,
         background: AppColors.input,
         foreground: AppColors.onSurface,
-        onTap: () => _comingSoon(l10n),
+        onTap: _openPhoneSheet,
       ),
       const SizedBox(height: 11),
       _AuthEntryButton(
@@ -374,10 +366,12 @@ class _AuthPageState extends State<AuthPage> {
     ],
   );
 
-  void _comingSoon(AppLocalizations l10n) {
-    ScaffoldMessenger.of(
+  Future<void> _openPhoneSheet() async {
+    final signedIn = await showPhoneAuthSheet(
       context,
-    ).showSnackBar(SnackBar(content: Text(l10n.comingSoon)));
+      signUp: _logic.signUpMode,
+    );
+    if (signedIn == true && mounted) Navigator.of(context).maybePop();
   }
 
   Widget _authCard(AppLocalizations l10n) => _AuthCard(
@@ -427,7 +421,6 @@ class _AuthEntryButton extends StatelessWidget {
     required this.foreground,
     required this.onTap,
     this.icon,
-    this.leadingColor,
   });
 
   final String label;
@@ -435,7 +428,6 @@ class _AuthEntryButton extends StatelessWidget {
   final Color foreground;
   final VoidCallback onTap;
   final IconData? icon;
-  final Color? leadingColor;
 
   @override
   Widget build(BuildContext context) {
@@ -451,7 +443,7 @@ class _AuthEntryButton extends StatelessWidget {
             mainAxisAlignment: MainAxisAlignment.center,
             children: [
               if (icon != null)
-                Icon(icon, size: 16, color: leadingColor ?? foreground),
+                Icon(icon, size: 16, color: foreground),
               if (icon != null) const SizedBox(width: 7),
               Flexible(
                 child: Text(