refactor(sidebar): clean up unused types and improve menu structure

- Removed legacy comments and unused type definitions from the sidebar component for better clarity.
- Added role information to user queries in the user router to enhance permission handling.
- Introduced a new schedule access permission in the RBAC schema and updated role permissions accordingly.
- Enhanced error messages in role management functions for improved user feedback.

packages/server/src/services/role.ts

@@ -59,7 +59,7 @@ export const removeRoleById = async (roleId: string) => {
 	});
 
 	if (members.length > 0) {
-		throw new Error("Cannot delete role with members");
+		throw new Error("Cannot delete role with assigned members");
 	}
 
 	await db.delete(role).where(eq(role.roleId, roleId));
@@ -77,6 +77,10 @@ export const updateRoleById = async (
 		throw new Error("Role not found");
 	}
 
+	if (currentRole.isSystem) {
+		throw new Error("Cannot update system role");
+	}
+
 	await db.update(role).set(input).where(eq(role.roleId, roleId));
 
 	return currentRole;