feat：分享功能

lib/features/profile/presentation/profile_action_pages.dart

@@ -4,10 +4,13 @@ import 'package:go_router/go_router.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:package_info_plus/package_info_plus.dart';
 import 'package:shadcn_ui/shadcn_ui.dart';
+import 'dart:ui' as ui;
 
 import '../../../common/domain/metal_type.dart';
 import '../../../common/domain/money.dart';
+import '../../../common/widgets/app_toast.dart';
 import '../../../common/router/app_router.dart';
+import '../../../common/util/share_util.dart';
 import '../../../common/widgets/adaptive.dart';
 import '../../../common/widgets/circle_back_button.dart';
 import '../../../common/widgets/prototype_ui.dart';
@@ -44,7 +47,7 @@ class InviteRewardPage extends StatelessWidget {
           ),
           const SizedBox(height: 14),
           FilledButton(
-            onPressed: () => _toast(context, '演示:拉起微信 / 系统分享面板'),
+            onPressed: () => toastInfo(msg: '演示:拉起微信 / 系统分享面板'),
             child: const Text('分享给好友'),
           ),
           const SizedBox(height: 14),
@@ -62,11 +65,42 @@ class InviteRewardPage extends StatelessWidget {
   }
 }
 
-class ShareCardPage extends ConsumerWidget {
+class ShareCardPage extends ConsumerStatefulWidget {
   const ShareCardPage({super.key});
 
   @override
-  Widget build(BuildContext context, WidgetRef ref) {
+  ConsumerState<ShareCardPage> createState() => _ShareCardPageState();
+}
+
+class _ShareCardPageState extends ConsumerState<ShareCardPage> {
+  final GlobalKey _previewKey = GlobalKey();
+  bool _sharing = false;
+
+  Future<void> _shareCard(String owner, {ui.Rect? origin}) async {
+    if (_sharing) return;
+    setState(() => _sharing = true);
+    try {
+      await sharePngFromBoundary(
+        _previewKey,
+        fileName: 'jinzhi_share_card.png',
+        text: '$owner 的贵金属估值卡，已通过金值生成。',
+        subject: '金值贵金属估值卡',
+        sharePositionOrigin: origin ?? shareOriginForContext(context),
+      );
+    } catch (e) {
+      debugPrint('share card failed: $e');
+      await Clipboard.setData(ClipboardData(text: '$owner 的贵金属估值卡，已通过金值生成。'));
+      if (!mounted) return;
+      toastInfo(msg: '图片分享失败，已复制分享文案');
+    } finally {
+      if (mounted) {
+        setState(() => _sharing = false);
+      }
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
     final auth = ref.watch(authProvider);
     final currentUser = auth.valueOrNull is LoggedInAuthState
         ? (auth.valueOrNull as LoggedInAuthState).user
@@ -79,7 +113,10 @@ class ShareCardPage extends ConsumerWidget {
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.stretch,
         children: [
-          _SharePreviewCard(owner: owner),
+          RepaintBoundary(
+            key: _previewKey,
+            child: _SharePreviewCard(owner: owner),
+          ),
           const SizedBox(height: 14),
           PrototypeCard(
             padding: EdgeInsets.zero,
@@ -100,13 +137,32 @@ class ShareCardPage extends ConsumerWidget {
             ),
           ),
           const SizedBox(height: 14),
-          FilledButton(
+          Builder(
+            builder: (buttonContext) => FilledButton.icon(
+              onPressed: _sharing
+                  ? null
+                  : () {
+                      final origin = shareOriginForContext(buttonContext);
+                      _shareCard(owner, origin: origin);
+                    },
+              icon: _sharing
+                  ? const SizedBox(
+                      width: 14,
+                      height: 14,
+                      child: CircularProgressIndicator(strokeWidth: 2),
+                    )
+                  : const Icon(Icons.ios_share_outlined),
+              label: Text(_sharing ? '分享中' : '系统分享图片'),
+            ),
+          ),
+          const SizedBox(height: 12),
+          OutlinedButton(
             onPressed: () async {
               await Clipboard.setData(
                 ClipboardData(text: '$owner 的贵金属估值卡，已通过金值生成。'),
               );
               if (!context.mounted) return;
-              _toast(context, '分享文案已复制');
+              toastInfo(msg: '分享文案已复制');
             },
             child: const Text('复制分享文案'),
           ),
@@ -152,7 +208,7 @@ class LocalBackupPage extends StatelessWidget {
           ),
           const SizedBox(height: 14),
           FilledButton(
-            onPressed: () => _toast(context, '已生成本地备份文件'),
+            onPressed: () => toastInfo(msg: '已生成本地备份文件'),
             child: const Text('生成备份'),
           ),
           const SizedBox(height: 12),
@@ -213,7 +269,7 @@ class CloudBackupPage extends ConsumerWidget {
               if (!loggedIn) {
                 context.push(AppRoutes.login);
               } else {
-                _toast(context, '云同步入口已打开');
+                toastInfo(msg: '云同步入口已打开');
               }
             },
             child: Text(loggedIn ? '开启云备份' : '去登录'),
@@ -256,7 +312,7 @@ class WidgetSettingsPage extends StatelessWidget {
           ),
           const SizedBox(height: 14),
           FilledButton(
-            onPressed: () => _toast(context, '演示:打开系统小组件设置'),
+            onPressed: () => toastInfo(msg: '演示:打开系统小组件设置'),
             child: const Text('添加到桌面'),
           ),
         ],
@@ -302,7 +358,7 @@ class PuritySettingsPage extends ConsumerWidget {
                       title: purity,
                       value: (settings.purityPresets[purity] ?? 1)
                           .toStringAsFixed(4),
-                      onTap: () => _toast(context, '演示:自定义「$purity」纯度系数'),
+                      onTap: () => toastInfo(msg: '演示:自定义「$purity」纯度系数'),
                     ),
                     if (purity != group.$2.last)
                       const PrototypeDivider(margin: EdgeInsets.zero),
@@ -599,12 +655,12 @@ class AboutPage extends StatelessWidget {
                 const SizedBox(height: 16),
                 _GoldTextAction(
                   label: '提交意见反馈',
-                  onTap: () => _toast(context, '演示:打开反馈表单'),
+                  onTap: () => toastInfo(msg: '演示:打开反馈表单'),
                 ),
                 const SizedBox(height: 10),
                 _GoldTextAction(
                   label: '检查更新',
-                  onTap: () => _toast(context, '当前已是最新版本'),
+                  onTap: () => toastInfo(msg: '当前已是最新版本'),
                 ),
               ],
             ),
@@ -718,7 +774,7 @@ class _InviteCodeCard extends StatelessWidget {
                       const ClipboardData(text: 'JINZHI-8K3F'),
                     );
                     if (!context.mounted) return;
-                    _toast(context, '已复制邀请码');
+                    toastInfo(msg: '已复制邀请码');
                   },
                   child: const Text(
                     '复制',
@@ -1419,7 +1475,3 @@ class _GoldDot extends StatelessWidget {
     );
   }
 }
-
-void _toast(BuildContext context, String message) {
-  ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(message)));
-}