feat(todo): a table's columns, chosen and moved, each with its menu (ADR 0033, D36)

As Todoist's after trying it: Description and Created join the columns,
Display's Columns turns them and a task's details on and off, and a heading
filters, sorts, moves or hides its column. Sorting can run either way, and
tasks can be filtered by when they were added. Reporting's project filter
shows each project's icon.

Whats-New: Table: choose and arrange its columns, and filter, sort or hide one from its heading.
Whats-New-De: Tabelle: Wähle und ordne die Spalten und filtere, sortiere oder blende eine über ihre Überschrift aus.

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_de.arb

@@ -287,6 +287,18 @@
   "groupNoLabel": "Ohne Label",
   "layoutTitle": "Layout",
   "layoutList": "Liste",
+  "taskColumnDescription": "Beschreibung",
+  "taskColumnCreated": "Erstellt",
+  "tableColumns": "Spalten",
+  "tableDetails": "Aufgabendetails",
+  "tableSubTasks": "Unteraufgaben",
+  "tableReminders": "Erinnerungen",
+  "tableFilter": "Filtern",
+  "tableSortUp": "Aufsteigend sortieren",
+  "tableSortDown": "Absteigend sortieren",
+  "tableMoveLeft": "Nach links",
+  "tableMoveRight": "Nach rechts",
+  "tableHide": "Spalte ausblenden",
   "layoutTable": "Tabelle",
   "taskColumnTask": "Aufgabe",
   "taskColumnDate": "Datum",