fix: extract types from .svelte files for proper named re-exports

Svelte 5 .svelte modules only expose a default export, so 'export type { X } from "./X.svelte"' fails type-check. Move shared interfaces into adjacent .ts type files.

- shared-ui/navigation: SpotlightAction, ContentSearcher, ContentSearch{Result,Group} → types.ts
- shared-auth-ui: PasskeyManagerTranslations, TwoFactorSetupTranslations, SessionManagerTranslations → types.ts
- mana/web/page-carousel: CarouselPage → new types.ts
- mana/web: bump @vitest/* to 4.1.2 (matches lockfile)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/shared-auth-ui/src/components/TwoFactorSetup.svelte

@@ -1,32 +1,6 @@
 <script lang="ts">
 	import QRCode from 'qrcode';
-	import type { AuthResult } from '../types';
-
-	export interface TwoFactorSetupTranslations {
-		title: string;
-		statusEnabled: string;
-		statusDisabled: string;
-		enableButton: string;
-		disableButton: string;
-		regenerateButton: string;
-		passwordLabel: string;
-		passwordPlaceholder: string;
-		confirmButton: string;
-		cancelButton: string;
-		setupTitle: string;
-		setupStep1: string;
-		setupStep2: string;
-		manualEntryLabel: string;
-		copyButton: string;
-		copiedButton: string;
-		doneButton: string;
-		disableConfirmTitle: string;
-		disableConfirmText: string;
-		backupCodesTitle: string;
-		backupCodesWarning: string;
-		copyCodesButton: string;
-		copiedCodesButton: string;
-	}
+	import type { AuthResult, TwoFactorSetupTranslations } from '../types';
 
 	const defaultTranslations: TwoFactorSetupTranslations = {
 		title: 'Zwei-Faktor-Authentifizierung',