Add LLM digest setup and share timestamp context

lib/core/config/app_config.dart

@@ -11,6 +11,17 @@ class AppConfig {
 
   static const String _defaultSentryDsn = String.fromEnvironment(
     'SENTRY_DSN',
+    defaultValue:
+        'https://97fb0a56bc35440fba0ba139dc3b1ccc@bugs.zuzo.ch/2',
+  );
+
+  static const String _defaultSentryEnvironment = String.fromEnvironment(
+    'SENTRY_ENVIRONMENT',
+    defaultValue: '',
+  );
+
+  static const String _defaultSentryRelease = String.fromEnvironment(
+    'SENTRY_RELEASE',
     defaultValue: '',
   );
 
@@ -53,9 +64,27 @@ class AppConfig {
     defaultValue: 180,
   );
 
-  /// Optional Sentry DSN for release crash/error reporting.
+  /// Sentry-compatible DSN for release crash/error reporting.
   static String get sentryDsn => _defaultSentryDsn.trim();
 
+  /// Sentry environment label.
+  static String get sentryEnvironment {
+    final String configured = _defaultSentryEnvironment.trim();
+    if (configured.isNotEmpty) {
+      return configured;
+    }
+    return useFakeBackend ? 'development' : 'production';
+  }
+
+  /// Optional Sentry release identifier.
+  static String? get sentryRelease {
+    final String configured = _defaultSentryRelease.trim();
+    if (configured.isEmpty) {
+      return null;
+    }
+    return configured;
+  }
+
   /// Runtime override for backend URL (e.g. local settings screen).
   static void overrideBackendBaseUrl(String? baseUrl) {
     _baseUrlOverride = baseUrl;