fix(settings): validate language against supported locales

[Olasunkanmi975]

##closed #779

Summary

Replaces the language length check with allowlist validation to ensure only supported locales are stored in the settings store. Unsupported locale values now automatically fall back to the default language.

Changes

• Imported SUPPORTED_LANGUAGES and DEFAULT_LANGUAGE from src/locales/config.ts.
• Updated patchSettings to validate language values against the supported locale allowlist.
• Replaced unsupported locales with the default language before storing.
• Removed the previous 24-character length clamp.
• Added tests covering valid and unsupported locale behavior.

Testing

Covered:

• Valid locale is stored successfully.
• Unsupported locale falls back to the default language.
• Supported locales continue to behave as expected.

Validation

npm test
npm run lint
npm run build

[drips-wave]

@Olasunkanmi975 Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits

[RUKAYAT-CODER]

Kindly resolve conflict and fix workflow.

[RUKAYAT-CODER]

Great job so far

There’s are just two blockers — the workflow is failing and the conflict. Could you take a look and fix it so all checks pass?

Happy to review again once that’s done.
You can pull from the main first before pushing. The workflow should pass

[Olasunkanmi975]

Hi maintainer, please review this pr

[RUKAYAT-CODER]

The workflow is still failing