i18n(todo): translate views/DetailView via $_() — title, prop rows, sections, meta

- Shell labels: notFound + confirmDelete
- Title input placeholder + Untitled fallback (was hardcoded English 'Untitled')
- Prop rows: Sichtbarkeit / Priorität (todo.priority) / Fällig (todo.dueDate) / Dauer (todo.duration) / Kalender labels
- Priority options routed via priorityKeys map → todo.priorityLow/Medium/High/Urgent
- Duration value with {n} interpolation, calendar Planen button + unschedule aria
- Tags / Beschreibung section labels (existing top-level keys)
- Subtasks count interpolation ({done}/{total})
- Meta footer Erstellt/Bearbeitet with {date} interpolation
- Toast undo "Aufgabe gelöscht"

Baselines: hardcoded 1042 → 1034 (8 cleared); missing-keys baseline unchanged.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/i18n-hardcoded-baseline.json

@@ -191,7 +191,6 @@
 	"apps/mana/apps/web/src/lib/modules/todo/components/pages/TodoPage.svelte": 1,
 	"apps/mana/apps/web/src/lib/modules/todo/components/SyncIndicator.svelte": 4,
 	"apps/mana/apps/web/src/lib/modules/todo/ListView.svelte": 1,
-	"apps/mana/apps/web/src/lib/modules/todo/views/DetailView.svelte": 8,
 	"apps/mana/apps/web/src/lib/modules/wetter/components/CurrentConditions.svelte": 2,
 	"apps/mana/apps/web/src/lib/modules/wetter/components/HourlyForecast.svelte": 1,
 	"apps/mana/apps/web/src/lib/modules/wetter/components/LocationPicker.svelte": 5,