i18n(quiz): translate EditView via $_() — header, meta inputs, question list, new-question form

- Header: back-button aria + "Quiz" label, Spielen play button
- Empty: "Quiz nicht gefunden."
- Meta-section: Titel/Beschreibung/Kategorie/Tags placeholders, Sichtbarkeit row label, untitled fallback
- Question list: "Fragen ({n})" heading, empty state, type-pill, edit/delete title+aria, "Frage löschen?" confirm
- Question types routed through $_('quiz.question_types.' + q.type); QUESTION_TYPE_LABELS constant kept in types.ts for non-Svelte callers
- New-question section: edit/new heading, cancel button, type select (4 options), question/correct-answer/expected-input fields, options-label (multi/single variant), correct-toggle title+aria, "Antwort {n}" placeholder, remove aria, "Antwort hinzufügen", explanation field, save/add submit button
- truefalse default options ("Wahr"/"Falsch") now i18n'd

Baselines: hardcoded 1218 → 1205 (13 cleared); missing-keys baseline +1 (quiz.question_types.* dynamic key).

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

scripts/i18n-hardcoded-baseline.json

@@ -170,7 +170,6 @@
 	"apps/mana/apps/web/src/lib/modules/profile/MeImagesView.svelte": 2,
 	"apps/mana/apps/web/src/lib/modules/questions/ListView.svelte": 1,
 	"apps/mana/apps/web/src/lib/modules/questions/views/DetailView.svelte": 6,
-	"apps/mana/apps/web/src/lib/modules/quiz/EditView.svelte": 13,
 	"apps/mana/apps/web/src/lib/modules/quiz/ListView.svelte": 5,
 	"apps/mana/apps/web/src/lib/modules/quiz/PlayView.svelte": 6,
 	"apps/mana/apps/web/src/lib/modules/quotes/views/DetailView.svelte": 2,