feat(mobile-app): change profile share button to navigate to share page

- Replace copy link action with navigation to share page
- Pass referralCode to share page for QR code generation
- Rename button text from '复制分享链接' to '分享邀请'

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/mobile-app/lib/features/profile/presentation/pages/profile_page.dart

@@ -246,14 +246,14 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
     );
   }
 
-  /// 复制分享链接
-  void _copyShareLink() {
-    Clipboard.setData(ClipboardData(text: 'https://rwa.app/invite/$_serialNumber'));
-    ScaffoldMessenger.of(context).showSnackBar(
-      const SnackBar(
-        content: Text('分享链接已复制'),
-        backgroundColor: Color(0xFFD4AF37),
-      ),
+  /// 跳转到分享页面
+  void _goToSharePage() {
+    context.push(
+      RoutePaths.share,
+      extra: {
+        'shareLink': 'https://s3.szaiai.com/rwadurian/app-release.apk',
+        'referralCode': _referralCode,
+      },
     );
   }
 
@@ -716,8 +716,8 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
           // 直推列表
           _buildReferralList(),
           const SizedBox(height: 16),
-          // 复制分享链接
-          _buildCopyShareButton(),
+          // 分享邀请按钮
+          _buildShareButton(),
           const SizedBox(height: 16),
           // 社区权益考核
           _buildCommunityAssessment(),
@@ -1242,10 +1242,10 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
     );
   }
 
-  /// 构建复制分享按钮
-  Widget _buildCopyShareButton() {
+  /// 构建分享按钮
+  Widget _buildShareButton() {
     return GestureDetector(
-      onTap: _copyShareLink,
+      onTap: _goToSharePage,
       child: Container(
         width: double.infinity,
         height: 48,
@@ -1264,7 +1264,7 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
             ),
             SizedBox(width: 8),
             Text(
-              '复制分享链接',
+              '分享邀请',
               style: TextStyle(
                 fontSize: 16,
                 fontFamily: 'Inter',