Adds hierarchical grouping and entity resolution support

Enhances calendar rendering with dynamic parent-child relationships between entities

Introduces EntityResolver for dot-notation references
Supports belongsTo configuration in grouping
Implements flexible filtering across hierarchical entities

Improves rendering flexibility for complex organizational structures

wwwroot/data/mock-teams.json

@@ -0,0 +1,14 @@
+[
+  {
+    "id": "team1",
+    "name": "Team Alpha",
+    "resourceIds": ["EMP001", "EMP002"],
+    "syncStatus": "synced"
+  },
+  {
+    "id": "team2",
+    "name": "Team Beta",
+    "resourceIds": ["EMP003", "EMP004"],
+    "syncStatus": "synced"
+  }
+]