feat(todo): a project as a table on wide windows (ADR 0033, D36)

Task, date, deadline, priority and labels in columns under a heading that
stays. A phone isn't offered it and shows a project kept as one as a list.

Whats-New: Table: on a wide window a project can show its tasks in columns, through Display.
Whats-New-De: Tabelle: In einem breiten Fenster zeigt ein Projekt seine Aufgaben in Spalten, über Anzeige.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

apps/todo/halkyon_todo_flutter/test/feature/project/project_payload_test.dart

@@ -69,6 +69,10 @@ void main() {
       }),
     );
     expect(read?.view, const ProjectView(completed: true));
+    expect(
+      decodeView(encodeView(const ProjectView(layout: ProjectLayout.table))),
+      const ProjectView(layout: ProjectLayout.table),
+    );
   });
 
   test('the payload names its schema and the colour by its name', () {