feat(dashboard): enhance widget availability and initialization

- Updated `getAvailableWidgets` method in `DashboardService` to merge default widget types with database entries, ensuring immediate visibility of new widgets post-deployment.
- Introduced `DASHBOARD_WIDGET_TYPE_DEFAULTS` in `initializeWidgetTypes` for canonical widget types, facilitating API merging when database entries are absent.
- Modified `StatusBar.vue` to utilize a computed property for quick access children, improving menu item handling and visibility based on user context.
- Enhanced `LoggedInView.vue` to dynamically return localized widget labels, improving user experience with accurate translations.

backend/sql/seed_dashboard_widget_types.sql

@@ -0,0 +1,22 @@
+-- Dashboard-Widget-Typen (type.widget_type)
+-- Für Produktion ohne initializeWidgetTypes / ohne Deploy-Sync.
+-- Idempotent: pro endpoint nur einfügen, wenn noch keine Zeile existiert.
+--
+-- Muss mit backend/utils/initializeWidgetTypes.js (DASHBOARD_WIDGET_TYPE_DEFAULTS)
+-- übereinstimmen – bei neuen Widgets beides anpassen.
+
+INSERT INTO type.widget_type (label, endpoint, description, order_id)
+SELECT v.label, v.endpoint, v.description, v.order_id
+FROM (
+  VALUES
+    ('Termine'::text, '/api/termine'::text, 'Bevorstehende Termine'::text, 1),
+    ('Falukant', '/api/falukant/dashboard-widget', 'Charakter, Geld, Nachrichten, Kinder', 2),
+    ('News', '/api/news?language=de&category=top', 'Nachrichten (newsdata.io), Counter für Pagination', 3),
+    ('Geburtstage', '/api/calendar/widget/birthdays', 'Nächste Geburtstage von Freunden', 4),
+    ('Nächste Termine', '/api/calendar/widget/upcoming', 'Anstehende Kalendertermine', 5),
+    ('Kalender', '/api/calendar/widget/mini', 'Mini-Kalenderansicht', 6),
+    ('Sprachkurse', '/api/vocab/dashboard-widget', 'Vokabelkurse, aktuelle Lektion, Sprung zur Lektion', 7)
+) AS v(label, endpoint, description, order_id)
+WHERE NOT EXISTS (
+  SELECT 1 FROM type.widget_type wt WHERE wt.endpoint = v.endpoint
+);