Adds Kasse (Cash Register) module and related components

Introduces comprehensive cash management functionality with multiple view components for tracking daily transactions, filtering, and reconciliation

Implements:
- Cash calculation and difference tracking
- Dynamic tab switching
- Checkbox selection and row expansion
- Date filtering and approval mechanisms

PlanTempus.Application/Features/Kasse/Components/KasseTable/KasseTableViewComponent.cs

@@ -0,0 +1,15 @@
+using Microsoft.AspNetCore.Mvc;
+
+namespace PlanTempus.Application.Features.Kasse.Components;
+
+/// <summary>
+/// ViewComponent for the reconciliation table on the Kasse list page.
+/// Shows all reconciliations with action bar and SAF-T export.
+/// </summary>
+public class KasseTableViewComponent : ViewComponent
+{
+    public IViewComponentResult Invoke()
+    {
+        return View();
+    }
+}