feat(app): 完善播放协议搜索与空状态

lib/pages/auth/auth_view.dart

@@ -6,6 +6,7 @@ import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
 import '../../core/data/remote/api_client.dart';
+import '../../core/formatting/error_text.dart';
 import '../../core/data/services/auth_controller.dart';
 import '../../core/platform/haptics.dart';
 import '../../core/platform/keyboard_inset.dart';
@@ -15,6 +16,7 @@ import '../../core/theme/app_theme.dart';
 import '../../core/widgets/centered_toast.dart';
 import '../../core/widgets/subpage_header.dart';
 import '../../l10n/app_localizations.dart';
+import 'auth_legal_links.dart';
 import 'auth_logic.dart';
 import 'phone_auth_sheet.dart';
 
@@ -26,8 +28,8 @@ const double _brandMarkSize = 72;
 const double _compactBrandMarkSize = 48;
 const double _brandMarkRadius = 20;
 const double _compactBrandMarkRadius = 14;
-const double _brandIconSize = 36;
-const double _compactBrandIconSize = 26;
+const double _landingLogoTopGap = 28;
+const String _appLogoAsset = 'assets/icon/fruitshorts.png';
 const double _contentMaxWidth = 440;
 // Auth keeps its approved 20px card silhouette.
 const double _cardRadius = AppDimens.authCardRadius;
@@ -58,31 +60,15 @@ Widget _brandMarkWidget({
   Key? key,
   required double size,
   required double radius,
-  required double iconSize,
 }) {
-  return Container(
+  return ClipRRect(
     key: key,
-    width: size,
-    height: size,
-    decoration: BoxDecoration(
-      borderRadius: BorderRadius.circular(radius),
-      gradient: const LinearGradient(
-        begin: Alignment.topLeft,
-        end: Alignment.bottomRight,
-        colors: [AppColors.blue, AppColors.secondary],
-      ),
-      boxShadow: [
-        BoxShadow(
-          color: AppColors.blue.withValues(alpha: 0.24),
-          blurRadius: 20,
-          offset: const Offset(0, 8),
-        ),
-      ],
-    ),
-    child: Icon(
-      Icons.play_arrow_rounded,
-      color: AppColors.onPrimary,
-      size: iconSize,
+    borderRadius: BorderRadius.circular(radius),
+    child: Image.asset(
+      _appLogoAsset,
+      width: size,
+      height: size,
+      fit: BoxFit.cover,
     ),
   );
 }
@@ -257,7 +243,7 @@ class _AuthPageState extends State<AuthPage> {
       if (!mounted) return;
       Navigator.of(context).maybePop();
     } on ApiException catch (error) {
-      failureMessage = error.message;
+      failureMessage = userFacingApiMessage(l10n, error.code, error.message);
     } catch (_) {
       failureMessage = l10n.authNetworkError;
     } finally {
@@ -431,12 +417,12 @@ class _AuthPageState extends State<AuthPage> {
     mainAxisAlignment: MainAxisAlignment.start,
     crossAxisAlignment: CrossAxisAlignment.stretch,
     children: [
+      const SizedBox(height: _landingLogoTopGap),
       Center(
         child: _brandMarkWidget(
           key: const Key('auth-brand-logo'),
           size: _brandMarkSize,
           radius: _brandMarkRadius,
-          iconSize: _brandIconSize,
         ),
       ),
       const SizedBox(height: 16),
@@ -473,16 +459,7 @@ class _AuthPageState extends State<AuthPage> {
         onTap: () => setState(() => _emailEntryOpen = true),
       ),
       const SizedBox(height: 18),
-      Text(
-        l10n.authLegal,
-        key: const Key('auth-legal'),
-        textAlign: TextAlign.center,
-        style: const TextStyle(
-          color: AppColors.muted,
-          fontSize: 9,
-          height: 1.6,
-        ),
-      ),
+      const AuthLegalLinks(),
     ],
   );