fix: implement persistent auth session using expo-secure-store

[Midoriya-w]

Closes #264

Changes:

• Implemented persistent auth session using expo-secure-store
• Token is saved to secure storage on login
• Token is restored automatically on app start via useEffect
• User profile is re-fetched if saved token exists
• Token is cleared from secure storage on logout
• If saved token is invalid/expired, storage is cleared automatically
• Replaces all TODO placeholders with working implementation

[Harxhit]

@ShantKhatri Could please look into this.

[ShantKhatri]

@ShantKhatri Could please look into this.

Sure.

[ShantKhatri]

Hi @Midoriya-w , allow some more time for this pr, as I need to test some other functionality and edge cases too. Thanks!

[Midoriya-w]

Hi @Midoriya-w , allow some more time for this pr, as I need to test some other functionality and edge cases too. Thanks!

sure take your time!

[ShantKhatri]

Hi @Midoriya-w , we are strictyly moved from expo, and our strict policy on not using any expo deps.

[Midoriya-w]

hey @ShantKhatri Thanks for reviewing.

I understand. Since the project has moved away from Expo dependencies, I'll update the implementation to use the existing AsyncStorage solution already present in the mobile app and push the changes shortly.

[github-actions]

CI Results — ❌ Some checks failed

Check	Status
🖥️ Backend	⏭️ Skipped — no changes detected
📱 Mobile	❌ failure
🌐 Web	⏭️ Skipped — no changes detected

⏭️ Skipped means no files were changed in that area — the check was not needed.

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🕐 Last updated: Mon, 01 Jun 2026 18:46:28 GMT

[Midoriya-w]

hey @ShantKhatri Tested locally.

Verified that the implementation now uses AsyncStorage instead of Expo Secure Store and the auth session persistence flow works as expected.

No blocking issues found from my side.

[Midoriya-w]

Hi @ShantKhatri, I've updated the PR to replace Expo Secure Store with AsyncStorage as requested. My branch is synced with the latest main and there are no merge conflicts locally. Could you please recheck the PR when you get a chance? Thanks!

[github-actions]

CI — All Checks Passed

Backend — SKIP

Check	Result
Lint	-
Test	-
Typecheck	-

Mobile — PASS

Check	Result
Lint	PASS
Test	PASS

Web — SKIP

Check	Result
Check	-
Build	-

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Last updated: Sat, 06 Jun 2026 12:20:40 GMT

[vercel]

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[Midoriya-w]

hey @ShantKhatri can you check on this pr.

[ShantKhatri]

Changes here are not relevant to issue, so closing this PR.