Square every corner, enlarge the main surfaces and add a to-do list

Rounded rectangles and round controls are now square across the app; only
status dots, glows, the sun, rings and the breathing circle stay round.
Cards, rows, thumbnails, featured cards, category tiles, the standing card
and the nav are larger. Home gets a quick To-do list kept on the device
(TodoItem in InternalMemory), seeded with sample items in mock mode.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KhQh614DMeYoQEH9SoMRUw

frontend/lib/Grounded/memory/ConnectInternalMemory.dart

@@ -3,6 +3,7 @@ import '../about/external/data/Program.dart';
 import '../about/external/data/SystemResponse.dart';
 import '../about/internal/application/CapacityProfile.dart';
 import '../about/internal/application/MeDescription.dart';
+import '../about/internal/application/TodoItem.dart';
 import '../about/internal/application/Token.dart';
 import '../about/internal/application/UserDetails.dart';
 
@@ -59,6 +60,11 @@ abstract class ConnectInternalMemory {
 
   Future setAmnestySpent(int spent);
 
+  /// The quick to-do list on Home.
+  Future<List<TodoItem>> getTodos();
+
+  Future setTodos(List<TodoItem> todos);
+
   Future<bool> showOnboarding();
 
   Future setOnboardingOption(bool value);