UI refinement

[ManishMadan2882]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

  • aligned the search icon in the navbar
  • increased the height in the prompt input/message input section to increase the typing area, user adds large text.

  Max height = 40% of the viewport height ( window.innerHeight * 0.4 ). Once content exceeds that, the textarea stops growing and scrolls internally (it has overflow-y-auto ).

• Why was this change needed? (You can also link to an open issue here)
  user interface and user experience improved

[vercel]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.14%. Comparing base (bb2a8ca) to head (e340fed).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2571   +/-   ##
=======================================
  Coverage   87.14%   87.14%           
=======================================
  Files         356      356           
  Lines       32353    32353           
=======================================
  Hits        28194    28194           
  Misses       4159     4159           

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