Implement WhatsApp share intake and person quick actions

test/features/share_intake/whatsapp_share_parser_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:relationship_saver/features/share_intake/whatsapp_share_parser.dart';
+
+void main() {
+  test('parses sender-prefixed WhatsApp text', () {
+    final WhatsAppSharePayload payload = WhatsAppShareParser.parse(
+      'Ava Hart: Lets do coffee on Saturday?',
+    );
+
+    expect(payload.sourceDisplayName, 'Ava Hart');
+    expect(payload.sourceUserId, 'wa:ava hart');
+    expect(payload.messageText, 'Lets do coffee on Saturday?');
+  });
+
+  test('parses bracket timestamp style WhatsApp export line', () {
+    final WhatsAppSharePayload payload = WhatsAppShareParser.parse(
+      '[2/17/26, 22:41] Jordan Lee: Finished 5k today!',
+    );
+
+    expect(payload.sourceDisplayName, 'Jordan Lee');
+    expect(payload.sourceUserId, 'wa:jordan lee');
+    expect(payload.messageText, 'Finished 5k today!');
+  });
+
+  test('falls back to raw message when sender cannot be detected', () {
+    const String raw = 'Remember to ask about her interview tomorrow.';
+    final WhatsAppSharePayload payload = WhatsAppShareParser.parse(raw);
+
+    expect(payload.sourceDisplayName, isNull);
+    expect(payload.sourceUserId, isNull);
+    expect(payload.messageText, raw);
+  });
+}