i18n(todo/settings): translate +page.svelte via $_() — all 6 sections + reset

- Page <title>, header h1, back-link aria
- Task Behavior: section heading, default-priority label + 4 options (priorityLow/Medium/High/Urgent), default-due-time label, auto-archive label + description
- View & Display: section heading, default-view label + 4 options (Inbox/Heute/Anstehend/Kanban), 4 toggle labels (Kompaktmodus/Aufgabenzahl/Teilaufgaben-Fortschritt/Nach Projekt gruppieren) with descriptions; converted 'as size' to 'as const as size' to silence Svelte 5 narrowing
- Kanban Board: section heading, Kartengröße label + 3 size labels (Kompakt/Normal/Groß), Labels-on-cards label, WIP-limit label + description
- Smart Duration: section heading, smartDurationEnabled label + description, defaultTaskDuration label
- Notifications: section heading, defaultReminder label + 6 options (Keine/5/15/30/1h/1d), 2 toggle labels (Tägliche Zusammenfassung/Überfällig)
- Productivity: section heading, 4 toggle labels with descriptions (Fokus-Modus/Pomodoro/Streak/Immersiver Modus), Tagesziel label
- Reset button + 'Alle Todo-Einstellungen zurücksetzen?' confirm

Baselines: hardcoded 1205 → 1192 (13 cleared); missing-keys baseline unchanged.

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

scripts/i18n-hardcoded-baseline.json

@@ -327,7 +327,6 @@
 	"apps/mana/apps/web/src/routes/(app)/times/clock/+page.svelte": 1,
 	"apps/mana/apps/web/src/routes/(app)/times/projects/[id]/+page.svelte": 3,
 	"apps/mana/apps/web/src/routes/(app)/todo/+page.svelte": 1,
-	"apps/mana/apps/web/src/routes/(app)/todo/settings/+page.svelte": 13,
 	"apps/mana/apps/web/src/routes/(app)/wetter/+page.svelte": 2,
 	"apps/mana/apps/web/src/routes/(auth)/reset-password/+page.svelte": 1,
 	"apps/mana/apps/web/src/routes/+error.svelte": 1,