feat: add local-first private AI digest workflow

Migrate app code into canonical feature slices, add phone-only AI digest scheduling and review, wire local notification/background task support, and cover the flow with tests.

lib/features/share_intake/application/README.md

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+# Share Intake Application
+
+This layer coordinates share-entry routing and the review flow. If content comes
+in from outside the app, this folder decides how it enters the local workflow.

lib/features/share_intake/application/share_capture_flow.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:relationship_saver/features/local/local_models.dart';
+import 'package:relationship_saver/features/people/presentation/people_view.dart';
+import 'package:relationship_saver/features/people/presentation/providers/people_ui_state.dart';
+import 'package:relationship_saver/features/share_intake/share_capture_models.dart';
+import 'package:relationship_saver/features/share_intake/share_capture_review_sheet.dart';
+import 'package:relationship_saver/features/share_intake/share_inbox_view.dart';
+import 'package:relationship_saver/features/share_intake/share_payload_parser.dart';
+
+SharedPayload? buildSharedPayloadFromRawText({
+  required String rawText,
+  required String platform,
+  String? sourceAppHint,
+}) {
+  final String trimmed = rawText.trim();
+  if (trimmed.isEmpty) {
+    return null;
+  }
+  final String sourceApp = SharePayloadParser.detectSourceApp(
+    rawText: trimmed,
+    sourceAppHint: sourceAppHint,
+  );
+  final SharedPayload payload = SharePayloadParser.parse(
+    rawText: trimmed,
+    sourceApp: sourceApp,
+    platform: platform,
+    createdAt: DateTime.now(),
+    receivedAt: DateTime.now(),
+  );
+  if (payload.rawText.trim().isEmpty && (payload.url?.trim().isEmpty ?? true)) {
+    return null;
+  }
+  return payload;
+}
+
+Future<SharedMessageIngestResult?> startShareCaptureReview(
+  BuildContext context, {
+  required WidgetRef ref,
+  required SharedPayload payload,
+}) {
+  return showShareCaptureReviewSheet(
+    context,
+    ref: ref,
+    payload: payload,
+    initialPersonId: ref.read(selectedPersonIdProvider),
+  );
+}
+
+void openShareCaptureDestination(
+  BuildContext context, {
+  required WidgetRef ref,
+  required SharedMessageIngestResult result,
+}) {
+  if (result.isQueuedForResolution) {
+    Navigator.of(context).push<void>(
+      MaterialPageRoute<void>(
+        builder: (BuildContext context) => const ShareInboxView(),
+      ),
+    );
+    return;
+  }
+
+  if (result.profileId != null) {
+    ref.read(selectedPersonIdProvider.notifier).select(result.profileId!);
+  }
+  Navigator.of(context).push<void>(
+    MaterialPageRoute<void>(
+      builder: (BuildContext context) => const PeopleView(),
+    ),
+  );
+}
+
+String shareCaptureResultMessage(SharedMessageIngestResult result) {
+  if (result.isQueuedForResolution) {
+    return 'Saved shared capture to inbox.';
+  }
+  if (result.createdProfile) {
+    return 'Saved shared capture and created ${result.profileName}.';
+  }
+  return 'Saved shared capture to ${result.profileName}.';
+}

lib/features/share_intake/application/share_capture_models.dart

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+class SharedMessageIngestInput {
+  const SharedMessageIngestInput({
+    required this.sourceApp,
+    required this.messageText,
+    this.sourceDisplayName,
+    this.sourceUserId,
+    this.sourceThreadId,
+    this.sharedAt,
+  });
+
+  final String sourceApp;
+  final String messageText;
+  final String? sourceDisplayName;
+  final String? sourceUserId;
+  final String? sourceThreadId;
+  final DateTime? sharedAt;
+}
+
+enum SharedMessageIngestStatus { imported, queuedForResolution }
+
+class SharedMessageIngestResult {
+  const SharedMessageIngestResult({
+    required this.status,
+    required this.createdProfile,
+    required this.createdSourceLink,
+    this.profileId,
+    this.profileName,
+    this.momentId,
+    this.inboxEntryId,
+  });
+
+  const SharedMessageIngestResult.imported({
+    required this.profileId,
+    required this.profileName,
+    required this.createdProfile,
+    required this.createdSourceLink,
+    required this.momentId,
+  }) : status = SharedMessageIngestStatus.imported,
+       inboxEntryId = null;
+
+  const SharedMessageIngestResult.queuedForResolution({
+    required this.inboxEntryId,
+  }) : status = SharedMessageIngestStatus.queuedForResolution,
+       createdProfile = false,
+       createdSourceLink = false,
+       profileId = null,
+       profileName = null,
+       momentId = null;
+
+  final SharedMessageIngestStatus status;
+  final String? profileId;
+  final String? profileName;
+  final bool createdProfile;
+  final bool createdSourceLink;
+  final String? momentId;
+  final String? inboxEntryId;
+
+  bool get isQueuedForResolution =>
+      status == SharedMessageIngestStatus.queuedForResolution;
+}