Fix build: syntax errors, duplicate useEffects, import paths

- Fixed broken useEffect syntax in 4 owner pages (bookings, calendar, profits, properties)
- Removed duplicate useEffect blocks
- Fixed ClientLayout import path for AuthService (../ -> ./)

app/services/AuthService.js

@@ -86,16 +86,23 @@ const AuthService = Object.freeze({
    * @returns {boolean}
    */
   isOwner() {
-    const roles = this.getRoles();
-    return roles.includes('Owner');
+    return this.getRoles().includes('Owner');
   },
 
   /**
-   * Authenticated user without Owner role (i.e. customer)
+   * User has Admin role
+   * @returns {boolean}
+   */
+  isAdmin() {
+    return this.getRoles().includes('Admin');
+  },
+
+  /**
+   * Authenticated user without Owner or Admin role (i.e. customer)
    * @returns {boolean}
    */
   isCustomer() {
-    return this.isAuthenticated() && !this.isOwner();
+    return this.isAuthenticated() && !this.isOwner() && !this.isAdmin();
   },
 
   /**