feat(vocab): add dashboard learning summary and related endpoints

- Introduced `getDashboardLearningSummary` method in `VocabService` to provide a compact overview of enrolled courses and current lessons for users.
- Updated `vocabController` to include a new route for the dashboard widget, allowing users to access their learning summary.
- Enhanced `vocabRouter` to route requests for the new dashboard widget endpoint.
- Added localization support for the new dashboard features across multiple languages, improving user engagement and accessibility.
- Updated UI components to integrate the new dashboard widget, ensuring a seamless user experience.

backend/sql/falukant_political_office_benefit_align_schema.sql

@@ -0,0 +1,44 @@
+-- Nur Schema-Fix für falukant_predefine.political_office_benefit
+-- (Fehler 23502: NULL in political_office_id trotz INSERT in office_type_id)
+--
+-- Ausführen, dann erneut falukant_political_office_benefits.sql
+
+DO $$
+BEGIN
+  IF NOT EXISTS (
+    SELECT 1 FROM information_schema.tables
+    WHERE table_schema = 'falukant_predefine' AND table_name = 'political_office_benefit'
+  ) THEN
+    RAISE EXCEPTION 'Tabelle fehlt.';
+  END IF;
+
+  IF EXISTS (
+    SELECT 1 FROM information_schema.columns
+    WHERE table_schema = 'falukant_predefine'
+      AND table_name = 'political_office_benefit'
+      AND column_name = 'political_office_id'
+  ) AND NOT EXISTS (
+    SELECT 1 FROM information_schema.columns
+    WHERE table_schema = 'falukant_predefine'
+      AND table_name = 'political_office_benefit'
+      AND column_name = 'office_type_id'
+  ) THEN
+    ALTER TABLE falukant_predefine.political_office_benefit
+      RENAME COLUMN political_office_id TO office_type_id;
+  ELSIF EXISTS (
+    SELECT 1 FROM information_schema.columns
+    WHERE table_schema = 'falukant_predefine'
+      AND table_name = 'political_office_benefit'
+      AND column_name = 'political_office_id'
+  ) AND EXISTS (
+    SELECT 1 FROM information_schema.columns
+    WHERE table_schema = 'falukant_predefine'
+      AND table_name = 'political_office_benefit'
+      AND column_name = 'office_type_id'
+  ) THEN
+    UPDATE falukant_predefine.political_office_benefit
+    SET office_type_id = COALESCE(office_type_id, political_office_id);
+    ALTER TABLE falukant_predefine.political_office_benefit
+      DROP COLUMN political_office_id;
+  END IF;
+END $$;