Adds comprehensive Settings page with multiple configuration tabs

Introduces a new Settings page with configurable modules:
- General company information
- Calendar and booking settings
- Billing and payment configurations
- Tracking and analytics integrations

Implements modular ViewComponents for each settings section
Enhances user experience with toggle switches and detailed configuration options

PlanTempus.Application/Features/Settings/Components/SettingsGeneral/SettingsGeneralViewComponent.cs

@@ -0,0 +1,15 @@
+using Microsoft.AspNetCore.Mvc;
+
+namespace PlanTempus.Application.Features.Settings.Components;
+
+/// <summary>
+/// ViewComponent for the general company settings tab.
+/// Handles company name, CVR, address, contact info.
+/// </summary>
+public class SettingsGeneralViewComponent : ViewComponent
+{
+    public IViewComponentResult Invoke()
+    {
+        return View();
+    }
+}