Improve share intake diagnostics

lib/features/share_intake/application/share_intake_debug_log.dart

@@ -4,12 +4,14 @@ import 'package:shared_preferences/shared_preferences.dart';
 
 const String _shareIntakeDebugLogKey = 'share_intake_debug_log_v1';
 const int _maxShareIntakeDebugEvents = 40;
+const int _maxShareIntakeDebugDetailChars = 6000;
 
 class ShareIntakeDebugEvent {
   const ShareIntakeDebugEvent({
     required this.at,
     required this.stage,
     required this.message,
+    this.details,
   });
 
   factory ShareIntakeDebugEvent.fromJson(Map<String, dynamic> json) {
@@ -19,18 +21,21 @@ class ShareIntakeDebugEvent {
       ).toLocal(),
       stage: json['stage'] as String? ?? 'unknown',
       message: json['message'] as String? ?? '',
+      details: json['details'] as String?,
     );
   }
 
   final DateTime at;
   final String stage;
   final String message;
+  final String? details;
 
   Map<String, dynamic> toJson() {
     return <String, dynamic>{
       'at': at.toUtc().toIso8601String(),
       'stage': stage,
       'message': message,
+      if (details != null) 'details': details,
     };
   }
 }
@@ -55,11 +60,16 @@ class ShareIntakeDebugLog {
     }
   }
 
-  Future<void> record(String stage, String message) async {
+  Future<void> record(String stage, String message, {String? details}) async {
     final SharedPreferences prefs = await SharedPreferences.getInstance();
     final List<ShareIntakeDebugEvent> current = await read();
     final List<ShareIntakeDebugEvent> next = <ShareIntakeDebugEvent>[
-      ShareIntakeDebugEvent(at: DateTime.now(), stage: stage, message: message),
+      ShareIntakeDebugEvent(
+        at: DateTime.now(),
+        stage: stage,
+        message: message,
+        details: _compactDetails(details),
+      ),
       ...current,
     ].take(_maxShareIntakeDebugEvents).toList(growable: false);
     await prefs.setString(
@@ -77,3 +87,14 @@ class ShareIntakeDebugLog {
     await prefs.remove(_shareIntakeDebugLogKey);
   }
 }
+
+String? _compactDetails(String? value) {
+  final String? trimmed = value?.trim();
+  if (trimmed == null || trimmed.isEmpty) {
+    return null;
+  }
+  if (trimmed.length <= _maxShareIntakeDebugDetailChars) {
+    return trimmed;
+  }
+  return '${trimmed.substring(0, _maxShareIntakeDebugDetailChars)}\n[truncated]';
+}

lib/features/share_intake/presentation/incoming_share_listener.dart

@@ -159,6 +159,12 @@ class _IncomingShareListenerState extends ConsumerState<IncomingShareListener> {
       return;
     }
 
+    await _debugLog.record(
+      'raw_share_text',
+      'Captured raw share text (${trimmed.length} chars).',
+      details: trimmed,
+    );
+
     final SharedPayload? payload = buildSharedPayloadFromRawText(
       rawText: trimmed,
       platform: defaultTargetPlatform.name,