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/lib/l10n/app_en.arb

@@ -737,6 +737,10 @@
   "@layoutList": {
     "description": "A project's layout in its Display, and its board's columns (ADR 0033, D17)."
   },
+  "layoutTable": "Table",
+  "taskColumnTask": "Task",
+  "taskColumnDate": "Date",
+  "taskColumnDeadline": "Deadline",
   "layoutBoard": "Board",
   "@layoutBoard": {
     "description": "A project's layout in its Display, and its board's columns (ADR 0033, D17)."