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/dashboard/domain/dashboard_models.dart

@@ -0,0 +1,73 @@
+// ignore_for_file: sort_constructors_first
+
+import 'package:flutter/foundation.dart';
+
+/// Lightweight task shown on the dashboard home surface.
+@immutable
+class DashboardTask {
+  const DashboardTask({
+    required this.id,
+    required this.title,
+    required this.description,
+    required this.when,
+    this.done = false,
+  });
+
+  final String id;
+  final String title;
+  final String description;
+  final DateTime when;
+  final bool done;
+
+  DashboardTask copyWith({
+    String? id,
+    String? title,
+    String? description,
+    DateTime? when,
+    bool? done,
+  }) {
+    return DashboardTask(
+      id: id ?? this.id,
+      title: title ?? this.title,
+      description: description ?? this.description,
+      when: when ?? this.when,
+      done: done ?? this.done,
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    return <String, dynamic>{
+      'id': id,
+      'title': title,
+      'description': description,
+      'when': when.toUtc().toIso8601String(),
+      'done': done,
+    };
+  }
+
+  factory DashboardTask.fromJson(Map<String, dynamic> json) {
+    return DashboardTask(
+      id: json['id'] as String,
+      title: json['title'] as String,
+      description: json['description'] as String,
+      when: DateTime.parse(json['when'] as String).toLocal(),
+      done: json['done'] as bool? ?? false,
+    );
+  }
+}
+
+/// Summary numbers consumed by the dashboard UI.
+@immutable
+class DashboardSummary {
+  const DashboardSummary({
+    required this.activePeople,
+    required this.upcomingPlans,
+    required this.pendingIdeas,
+    required this.weeklyConsistency,
+  });
+
+  final int activePeople;
+  final int upcomingPlans;
+  final int pendingIdeas;
+  final int weeklyConsistency;
+}