feat(ui): 登录页重设计并统一弹框主题渐变外壳

lib/core/widgets/app_glow_panel.dart

@@ -0,0 +1,119 @@
+// Author: fruit.com.cn
+
+import 'package:flutter/material.dart';
+
+import '../theme/app_colors.dart';
+import '../theme/app_dimens.dart';
+
+/// 主题红晕渐变容器：弹框（居中）与底部弹层（半屏）共用的外壳。
+/// 纯黑弹框统一升级为「顶部红光 → 近黑」的家族渐变。
+class AppGlowPanel extends StatelessWidget {
+  const AppGlowPanel({
+    super.key,
+    required this.child,
+    this.borderRadius = const BorderRadius.all(Radius.circular(20)),
+    this.border = true,
+  });
+
+  final Widget child;
+  final BorderRadius borderRadius;
+  final bool border;
+
+  static const _gradient = LinearGradient(
+    begin: Alignment.topCenter,
+    end: Alignment.bottomCenter,
+    colors: [
+      AppColors.followingGlow,
+      AppColors.followingGlowMid,
+      Color(0xFF101012),
+    ],
+    stops: [0, 0.22, 0.62],
+  );
+
+  @override
+  Widget build(BuildContext context) {
+    return DecoratedBox(
+      decoration: BoxDecoration(
+        gradient: _gradient,
+        borderRadius: borderRadius,
+        border: border
+            ? Border.all(color: AppColors.contentBorder)
+            : null,
+      ),
+      child: child,
+    );
+  }
+}
+
+/// 主题渐变确认弹框：替代 AlertDialog 的家族化外壳。
+/// 按钮沿用项目惯例：纯文字 TextButton，主操作品牌红。
+class AppGlowDialog extends StatelessWidget {
+  const AppGlowDialog({
+    super.key,
+    this.title,
+    this.content,
+    this.contentChild,
+    this.actions,
+    this.contentTextStyle,
+  });
+
+  final String? title;
+  final String? content;
+
+  /// 富内容（表单/滚动区），与 [content] 二选一。
+  final Widget? contentChild;
+  final List<Widget>? actions;
+  final TextStyle? contentTextStyle;
+
+  @override
+  Widget build(BuildContext context) {
+    final bodyStyle = contentTextStyle ??
+        TextStyle(
+          color: AppColors.muted,
+          fontSize: AppDimens.body,
+          fontWeight: FontWeight.w400,
+        );
+    return Dialog(
+      backgroundColor: AppColors.transparent,
+      elevation: 0,
+      child: AppGlowPanel(
+        child: Padding(
+          padding: const EdgeInsets.fromLTRB(22, 22, 22, 10),
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              if (title != null) ...[
+                Text(
+                  title!,
+                  style: TextStyle(
+                    color: AppColors.onSurface,
+                    fontSize: AppDimens.sectionTitle,
+                    fontWeight: FontWeight.w400,
+                  ),
+                ),
+                const SizedBox(height: 14),
+              ],
+              if (content != null)
+                Text(content!, style: bodyStyle)
+              else
+                ?contentChild,
+              if (actions != null && actions!.isNotEmpty) ...[
+                const SizedBox(height: 18),
+                Row(
+                  mainAxisAlignment: MainAxisAlignment.end,
+                  children: [
+                    for (var i = 0; i < actions!.length; i++) ...[
+                      if (i > 0) const SizedBox(width: 4),
+                      actions![i],
+                    ],
+                  ],
+                ),
+              ],
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}

lib/core/widgets/auth_gate.dart

@@ -5,6 +5,7 @@ import '../../l10n/app_localizations.dart';
 import '../../pages/auth/auth_view.dart';
 import '../data/services/auth_controller.dart';
 import '../theme/app_colors.dart';
+import 'app_glow_panel.dart';
 
 /// 打开登录 / 注册页（沿用现有 Navigator 风格，不引路由库）
 Future<void> openAuthPage(BuildContext context, {bool signUpMode = false}) {
@@ -23,11 +24,11 @@ Future<bool> ensureSignedIn(BuildContext context) async {
   final l10n = AppLocalizations.of(context)!;
   final go = await showModalBottomSheet<bool>(
     context: context,
-    backgroundColor: AppColors.card,
-    shape: const RoundedRectangleBorder(
-      borderRadius: BorderRadius.vertical(top: Radius.circular(18)),
-    ),
-    builder: (sheetContext) => SafeArea(
+    backgroundColor: AppColors.transparent,
+    builder: (sheetContext) => AppGlowPanel(
+      borderRadius: const BorderRadius.vertical(top: Radius.circular(18)),
+      border: false,
+      child: SafeArea(
       child: Padding(
         padding: const EdgeInsets.fromLTRB(20, 18, 20, 20),
         child: Column(
@@ -71,6 +72,7 @@ Future<bool> ensureSignedIn(BuildContext context) async {
           ],
         ),
       ),
+      ),
     ),
   );
 

lib/core/widgets/catalog_endpoint_editor.dart

@@ -6,6 +6,7 @@ import 'package:flutter/material.dart';
 import '../config/app_config.dart';
 import '../config/server_endpoint.dart';
 import '../theme/app_colors.dart';
+import 'app_glow_panel.dart';
 
 const String _title = '设置服务地址';
 const String _save = '保存';
@@ -72,9 +73,9 @@ class _CatalogEndpointDialogState extends State<_CatalogEndpointDialog> {
 
   @override
   Widget build(BuildContext context) {
-    return AlertDialog(
-      title: const Text(_title),
-      content: SingleChildScrollView(
+    return AppGlowDialog(
+      title: _title,
+      contentChild: SingleChildScrollView(
         child: Column(
           mainAxisSize: MainAxisSize.min,
           crossAxisAlignment: CrossAxisAlignment.start,