fix: avoid null active loginid on logout

[habib-deriv]

Summary

• stop storing "null" as active_loginid during logout
• avoid landing company errors by clearing login identifiers

Testing

• npm run test:stylelint
• npx nx run @deriv/core:test:eslint
• npx jest packages/core/src/Stores/client-store.js --passWithNoTests

---

https://chatgpt.com/codex/tasks/task_b_68946b9d54cc832da154e79b005ab07f

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Name	Status	Preview	Updated (UTC)
deriv-app	✅ Ready (Inspect)	Visit Preview	Aug 7, 2025 10:58am

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

OpenSSF Scorecard

Package	Version	Score	Details

Scanned Manifest Files

[github-actions]

A production App ID was automatically generated for this PR. (log)

• PR: fix: avoid null active loginid on logout #18811
• URLs:
  • w/ App ID + Server: https://deriv-app-git-codex-fix-logout-error-on-appderivcom.binary.sx?qa_server=red.derivws.com&app_id=31586
  • Original: https://deriv-app-git-codex-fix-logout-error-on-appderivcom.binary.sx
• App ID: 31586

Click here to copy & paste above information.

- **PR**: [https://github.com/deriv-com/deriv-app/pull/18811](https://github.com/deriv-com/deriv-app/pull/18811)
- **URLs**:
    - **w/ App ID + Server**: https://deriv-app-git-codex-fix-logout-error-on-appderivcom.binary.sx?qa_server=red.derivws.com&app_id=31586
    - **Original**: https://deriv-app-git-codex-fix-logout-error-on-appderivcom.binary.sx
- **App ID**: `31586`

[github-actions]

⏳ Generating Lighthouse report...

[github-actions]

package	old	new	diff	pct change
account	294 KB	294 KB	0 B	0% 🟢
appstore	283 KB	283 KB	0 B	0% 🟢
bot-web-ui	775 KB	775 KB	0 B	0% 🟢
cashier	560 KB	560 KB	0 B	0% 🟢
cfd	123 KB	123 KB	0 B	0% 🟢
core	8.5 MB	8.5 MB	--334 B	−-0.0% 🟢
p2p	1.0 MB	1.0 MB	0 B	0% 🟢
reports	67 KB	67 KB	0 B	0% 🟢
trader	634 KB	634 KB	0 B	0% 🟢
wallets	851 KB	851 KB	0 B	0% 🟢