fix: close language dropdown and chatbotwindow on outside click (#765)

[Aryanbansal-05]

Description

• Added useRef + useEffect click-outside handler to the language
  selector dropdown in Navbar.js
• Added the same pattern to the AI Chatbotwindow component

Closes #765

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

1. Open the app
2. Click the language dropdown → click outside → it closes
3. Open the chatbotwindow → click outside → it closes

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

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[Aryanbansal-05]

Hi @souma9830, could you please review and merge this PR? All checks are passing and there are no conflicts with the base branch. Thank you!

[Aryanbansal-05]

Hi @souma9830, could you please review and merge this PR? All checks are passing and there are no conflicts with the base branch. Thank you!

[Aryanbansal-05]

Hi @souma9830, could you please review and merge this PR? All checks are passing and there are no conflicts with the base branch. Thank you!