feat(profile): add username + preferred_locale; wire to Inertia + middleware

- DB: users.username (unique), users.preferred_locale (default from app.locale)
- Backend: validation, model fillable; share supportedLocales; SetLocaleFromUser
- Frontend: profile page fields + types
- Filament: SuperAdmin profile page with username/language

feat(admin-nav): move Tasks to Bibliothek and add menu labels

fix(tasks-table): show localized title/emotion/event type; add translated headers

feat(l10n): add missing table headers for emotions and event types; normalize en/de files

refactor: tidy translations for tasks/emotions/event types

resources/js/types/index.d.ts

@@ -27,6 +27,7 @@ export interface SharedData {
     quote: { message: string; author: string };
     auth: Auth;
     sidebarOpen: boolean;
+    supportedLocales?: string[];
     [key: string]: unknown;
 }
 
@@ -34,6 +35,8 @@ export interface User {
     id: number;
     name: string;
     email: string;
+    username?: string;
+    preferred_locale?: string;
     avatar?: string;
     email_verified_at: string | null;
     created_at: string;