Widget UI fixes

[ManishMadan2882]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  UI Fixes and enhancement
  • Alignment of message icon
    
  • Font Size slightly increased
  • Border radius of the widget component increased to 0.75rem
  • send button dimensions enhanced
  • indented the prompt input field
  • cross(x) icon enlarged
• Why was this change needed? (You can also link to an open issue here)
  Fixes Feedback widget #871
• Other Information
  

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 20.05%. Comparing base (b96fe16) to head (1a91a24).
Report is 33 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #872   +/-   ##
=======================================
  Coverage   20.05%   20.05%           
=======================================
  Files          72       72           
  Lines        3246     3246           
=======================================
  Hits          651      651           
  Misses       2595     2595           

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Name	Status	Preview	Comments	Updated (UTC)
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[dartpain]

Thank you!