refactor: 重构弹窗组件支持自定义图标组件

apps/lib/shared/widgets/app_modal_dialog.dart

@@ -23,11 +23,13 @@ class AppModalDialog extends StatelessWidget {
     required this.message,
     required this.actions,
     this.icon,
+    this.iconWidget,
   });
 
   final String title;
   final String message;
   final IconData? icon;
+  final Widget? iconWidget;
   final List<AppModalDialogAction> actions;
 
   @override
@@ -59,9 +61,9 @@ class AppModalDialog extends StatelessWidget {
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
             Row(
-              crossAxisAlignment: CrossAxisAlignment.start,
+              crossAxisAlignment: CrossAxisAlignment.center,
               children: [
-                if (icon != null)
+                if (iconWidget != null || icon != null)
                   Container(
                     width: 36,
                     height: 36,
@@ -70,9 +72,12 @@ class AppModalDialog extends StatelessWidget {
                       borderRadius: BorderRadius.circular(AppRadius.md),
                     ),
                     alignment: Alignment.center,
-                    child: Icon(icon, color: colors.primary, size: 20),
+                    child:
+                        iconWidget ??
+                        Icon(icon, color: colors.primary, size: 20),
                   ),
-                if (icon != null) const SizedBox(width: AppSpacing.sm),
+                if (iconWidget != null || icon != null)
+                  const SizedBox(width: AppSpacing.sm),
                 Expanded(
                   child: Text(
                     title,

apps/lib/shared/widgets/gua_icon.dart

@@ -0,0 +1,22 @@
+import 'package:flutter/material.dart';
+
+class GuaIcon extends StatelessWidget {
+  const GuaIcon({super.key, this.color, this.size = 20});
+
+  final Color? color;
+  final double size;
+
+  @override
+  Widget build(BuildContext context) {
+    final effectiveColor =
+        color ?? Theme.of(context).colorScheme.onPrimaryContainer;
+    return Text(
+      '爻',
+      style: TextStyle(
+        fontSize: size * 0.85,
+        fontWeight: FontWeight.w700,
+        color: effectiveColor,
+      ),
+    );
+  }
+}