test(utils): check boundary robustness of JSON response serializer (JhaSourav07#1646)

Fixes JhaSourav07#1556

## Description
Added a boundary test to verify that `trackUser` handles
non-serializable
JSON payloads gracefully without throwing. Also updated `tracking.ts` to
wrap `JSON.stringify` in a try/catch to prevent uncaught exceptions.

## Changes Made
- Added test for circular reference input in `utils/tracking.test.ts`
- Wrapped `JSON.stringify` in try/catch in `utils/tracking.ts`

## Pillar
- [x] 🛠️ Other (Bug fix, refactoring, docs)

## Checklist
- [x] I have read the `CONTRIBUTING.md` file.
- [x] I have tested these changes locally.
- [x] `npm run format` and `npm run lint` pass locally ✅
- [x] `npm run test` passes locally ✅
- [x] My commits follow Conventional Commits format.
- [x] I have starred the repo.
- [x] I have only one commit in this PR.
- [x] (Recommended) I joined the CommitPulse Discord server.

Author: meetparmar392005

utils/tracking.test.ts

@@ -114,6 +114,24 @@ describe('trackUser', () => {
 
     expect(fetchMock).toHaveBeenCalledTimes(1);
   });
+
+  it('handles non-serializable input gracefully without throwing', () => {
+    // A circular reference cannot be serialized by JSON.stringify and will throw
+    // a TypeError. This test verifies that the utility does not propagate the
+    // exception to the caller.
+    const circular: Record<string, unknown> = {};
+    circular['self'] = circular;
+
+    const originalStringify = JSON.stringify;
+    vi.spyOn(JSON, 'stringify').mockImplementationOnce(() => {
+      throw new TypeError('Converting circular structure to JSON');
+    });
+
+    expect(() => trackUser('testuser')).not.toThrow();
+
+    JSON.stringify = originalStringify;
+  });
+
   it('does not run in SSR context when window is undefined', () => {
     const originalWindow = globalThis.window;
     const sendBeaconMock = vi.fn();
@@ -128,14 +146,10 @@ describe('trackUser', () => {
       value: sendBeaconMock,
       configurable: true,
     });
-
     vi.stubGlobal('fetch', fetchMock);
-
     trackUser('octocat');
-
     expect(sendBeaconMock).not.toHaveBeenCalled();
     expect(fetchMock).not.toHaveBeenCalled();
-
     Object.defineProperty(globalThis, 'window', {
       value: originalWindow,
       configurable: true,

utils/tracking.ts

@@ -2,7 +2,12 @@ export function trackUser(username: string) {
   if (typeof navigator === 'undefined' || typeof window === 'undefined') return;
   if (!username) return;
 
-  const payload = JSON.stringify({ username });
+  let payload: string;
+  try {
+    payload = JSON.stringify({ username });
+  } catch {
+    return;
+  }
 
   const beaconQueued = navigator.sendBeacon
     ? navigator.sendBeacon('/api/track-user', new Blob([payload], { type: 'application/json' }))