test(utils): add edge case tests for format()

Author: Thesmoothengineer

js/utils/__tests__/utils.test.js

@@ -292,5 +292,13 @@ describe("Utility Functions (logic-only)", () => {
             const result = format("Static text", {});
             expect(result).toBe("Static text");
         });
+        it("should return empty string for missing nested property", () => {
+            const result = format("User: {user.age}", { user: { name: "Alice" } });
+            expect(result).toBe("User: ");
+        });
+        it("should return original string if no placeholders exist", () => {
+            const result = format("Hello world", { name: "User" });
+            expect(result).toBe("Hello world");
+        });
     });
 });