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/people/presentation/providers/people_ui_state.dart

@@ -0,0 +1,70 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+/// Current sort mode for the people list.
+enum PeopleSortOption { affinity, nextMoment, alphabetical }
+
+/// Selected profile in the people workspace.
+class SelectedPersonIdNotifier extends Notifier<String?> {
+  @override
+  String? build() => null;
+
+  void select(String id) {
+    state = id;
+  }
+
+  void clear() {
+    state = null;
+  }
+}
+
+final NotifierProvider<SelectedPersonIdNotifier, String?>
+selectedPersonIdProvider = NotifierProvider<SelectedPersonIdNotifier, String?>(
+  SelectedPersonIdNotifier.new,
+);
+
+/// Search query applied to the people list.
+class PeopleSearchQueryNotifier extends Notifier<String> {
+  @override
+  String build() => '';
+
+  void set(String value) {
+    state = value;
+  }
+}
+
+final NotifierProvider<PeopleSearchQueryNotifier, String>
+peopleSearchQueryProvider = NotifierProvider<PeopleSearchQueryNotifier, String>(
+  PeopleSearchQueryNotifier.new,
+);
+
+/// Relationship filter applied to the people list.
+class PeopleRelationshipFilterNotifier extends Notifier<String?> {
+  @override
+  String? build() => null;
+
+  void set(String? value) {
+    state = value;
+  }
+}
+
+final NotifierProvider<PeopleRelationshipFilterNotifier, String?>
+peopleRelationshipFilterProvider =
+    NotifierProvider<PeopleRelationshipFilterNotifier, String?>(
+      PeopleRelationshipFilterNotifier.new,
+    );
+
+/// Selected sort mode for the people list.
+class PeopleSortOptionNotifier extends Notifier<PeopleSortOption> {
+  @override
+  PeopleSortOption build() => PeopleSortOption.affinity;
+
+  void set(PeopleSortOption value) {
+    state = value;
+  }
+}
+
+final NotifierProvider<PeopleSortOptionNotifier, PeopleSortOption>
+peopleSortOptionProvider =
+    NotifierProvider<PeopleSortOptionNotifier, PeopleSortOption>(
+      PeopleSortOptionNotifier.new,
+    );