Makes input field absolute in Conversation, fixes delete icon in Settings/Documents

[ManishMadan2882]

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

• Fixes improper button removal after deletion of documents in settings.
• Reused the reducer to setSourceDocs() ensuring proper deletion of complete row from the UI.
• Fixes Input box in the Conversation, making it absolute with respect to the conversation bubbles.
  

• Why was this change needed? (You can also link to an open issue here)

• fixes 🐛 Bug Report: When delete button is pressed in the settings menu, it is not displayed in UI correctly #834
• Enhances responsiveness .

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (615d549) 19.13% compared to head (8826f0f) 19.13%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #848   +/-   ##
=======================================
  Coverage   19.13%   19.13%           
=======================================
  Files          65       65           
  Lines        3016     3016           
=======================================
  Hits          577      577           
  Misses       2439     2439           

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[dartpain]

Good PR, thank you!