feat: Introduce dynamic tab management, sidebar, and search bar components, update backend database schema, and remove old SQL schema.

docs/development/devlog/2025-12-03_backend_fix.md

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+# Backend Fix - Sync Model Changes
+
+## Problem
+The backend was failing to start with a `System.InvalidOperationException` because the `ZentralDbContext` model had pending changes that were not captured in a migration.
+
+## Solution
+1.  Created a new migration `SyncModelChanges` to synchronize the database schema with the code.
+    - Command: `dotnet ef migrations add SyncModelChanges --project Zentral.Infrastructure --startup-project Zentral.API`
+2.  Updated the database.
+    - Command: `dotnet ef database update --project Zentral.Infrastructure --startup-project Zentral.API`
+
+## Status
+- [x] Create Migration
+- [x] Update Database
+- [x] Verify Backend Startup
+
+The backend now starts correctly and listens on the configured port.