Add accepted leg edit notification and class leaderboard

lib/components/widgets/leg_share_notification_card.dart

@@ -1,4 +1,5 @@
 import 'dart:async';
+import 'dart:convert';
 
 import 'package:flutter/material.dart';
 import 'package:go_router/go_router.dart';
@@ -14,8 +15,8 @@ class LegShareNotificationCard extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final data = context.read<DataService>();
-    final legShareId = notification.body.trim();
-    if (legShareId.isEmpty) {
+    final legShareId = _extractLegShareId(notification.body);
+    if (legShareId == null) {
       return const Text('Invalid leg share notification.');
     }
     final future = data.fetchLegShare(legShareId);
@@ -144,4 +145,19 @@ class LegShareNotificationCard extends StatelessWidget {
     final path = '/add?share=${Uri.encodeComponent(share.id)}&ts=$ts';
     router.go(path, extra: target);
   }
+
+  String? _extractLegShareId(String rawBody) {
+    final trimmed = rawBody.trim();
+    if (trimmed.isEmpty) return null;
+    if (RegExp(r'^[0-9]+$').hasMatch(trimmed)) return trimmed;
+    try {
+      final decoded = jsonDecode(trimmed);
+      if (decoded is Map) {
+        final id = decoded['share_id'] ?? decoded['leg_share_id'];
+        final str = id?.toString() ?? '';
+        if (RegExp(r'^[0-9]+$').hasMatch(str)) return str;
+      }
+    } catch (_) {}
+    return null;
+  }
 }