Adds department view to calendar application

Introduces department-level grouping and rendering in the calendar view

Extends the application to support:
- Department-based resource filtering
- Dynamic department header rendering
- Mock department data infrastructure

Enables more granular organizational views

wwwroot/data/mock-departments.json

@@ -0,0 +1,14 @@
+[
+  {
+    "id": "dept-styling",
+    "name": "Styling",
+    "resourceIds": ["EMP001", "EMP002", "EMP003"],
+    "syncStatus": "synced"
+  },
+  {
+    "id": "dept-training",
+    "name": "Training",
+    "resourceIds": ["EMP004", "STUDENT001", "STUDENT002"],
+    "syncStatus": "synced"
+  }
+]