Add LLM digest setup and share timestamp context

test/features/share_intake/share_payload_parser_test.dart

@@ -39,6 +39,33 @@ void main() {
     expect(payload.rawText, 'loves cozy Italian restaurants');
   });
 
+  test('stores source message datetime when WhatsApp text includes one', () {
+    final SharedPayload payload = SharePayloadParser.parse(
+      rawText: '[19/05/2026, 14:30] Ava Hart: ginger tea helped',
+      sourceApp: 'whatsapp',
+      platform: 'ios',
+    );
+
+    expect(payload.sourceDisplayName, 'Ava Hart');
+    expect(payload.rawText, 'ginger tea helped');
+    expect(payload.sharedMessageDateTime, DateTime(2026, 5, 19, 14, 30));
+    expect(payload.parsingHints, contains('shared_message_datetime_detected'));
+    expect(payload.metadata, contains('shared_message_datetime'));
+  });
+
+  test(
+    'does not store source message datetime for arbitrary content dates',
+    () {
+      final SharedPayload payload = SharePayloadParser.parse(
+        rawText: 'Ava birthday is on May 20 and she likes ginger tea.',
+        sourceApp: 'share_sheet',
+        platform: 'ios',
+      );
+
+      expect(payload.sharedMessageDateTime, isNull);
+    },
+  );
+
   test('uses explicit signal source app hint and extracts sender', () {
     final SharedPayload payload = SharePayloadParser.parse(
       rawText: 'Marek: this concert looks promising',

test/features/share_intake/shared_message_datetime_extractor_test.dart

@@ -0,0 +1,58 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:relationship_saver/features/share_intake/domain/shared_message_datetime_extractor.dart';
+
+void main() {
+  group('SharedMessageDateTimeExtractor', () {
+    test('extracts WhatsApp bracketed European timestamp', () {
+      final DateTime? value = SharedMessageDateTimeExtractor.extract(
+        '[19/05/2026, 14:30] Ava Hart: I was sick but ginger tea helped',
+      );
+
+      expect(value, DateTime(2026, 5, 19, 14, 30));
+    });
+
+    test('extracts exported chat prefix with US meridiem timestamp', () {
+      final DateTime? value = SharedMessageDateTimeExtractor.extract(
+        '5/19/26, 2:30 PM - Ava Hart: ginger tea helped',
+      );
+
+      expect(value, DateTime(2026, 5, 19, 14, 30));
+    });
+
+    test('extracts labelled month-name timestamp', () {
+      final DateTime? value = SharedMessageDateTimeExtractor.extract(
+        'Received at: 19 May 2026 at 14:30\nAva: ginger tea helped',
+      );
+
+      expect(value, DateTime(2026, 5, 19, 14, 30));
+    });
+
+    test(
+      'extracts relative labelled timestamp using provided reference date',
+      () {
+        final DateTime? value = SharedMessageDateTimeExtractor.extract(
+          'Yesterday at 21:05 - Ava Hart: ginger tea helped',
+          now: DateTime(2026, 5, 19, 9),
+        );
+
+        expect(value, DateTime(2026, 5, 18, 21, 5));
+      },
+    );
+
+    test('does not treat arbitrary content date as message timestamp', () {
+      final DateTime? value = SharedMessageDateTimeExtractor.extract(
+        'Ava birthday is on May 20 and she likes ginger tea.',
+      );
+
+      expect(value, isNull);
+    });
+
+    test('returns null instead of throwing for invalid dates', () {
+      final DateTime? value = SharedMessageDateTimeExtractor.extract(
+        '[99/99/2026, 25:99] Ava: impossible',
+      );
+
+      expect(value, isNull);
+    });
+  });
+}