Improve loading state feedback for LLM responses

[jdisho]

Improve loading state feedback for LLM responses

♻️ Current situation & Problem

Resolving #55

⚙️ Release Notes

• Instead of a spinner, the chat shows a bubble animation that animates right where the response will appear, making it clear where to look for the incoming responses.
• The chat also allows users to close the chat view during this time, canceling any requests that are in progress.

Code of Conduct & Contributing Guidelines

By submitting creating this pull request, you agree to follow our Code of Conduct and Contributing Guidelines:

• I agree to follow the Code of Conduct and Contributing Guidelines.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 32 lines in your changes missing coverage. Please review.

Project coverage is 43.87%. Comparing base (59b59ef) to head (c52ac65).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../MultipleResources/MultipleResourcesChatView.swift	0.00%	32 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #59      +/-   ##
==========================================
+ Coverage   40.44%   43.87%   +3.43%     
==========================================
  Files          31       31              
  Lines        1422     1418       -4     
==========================================
+ Hits          575      622      +47     
+ Misses        847      796      -51     

Files with missing lines	Coverage Δ
.../MultipleResources/MultipleResourcesChatView.swift	0.00% <0.00%> (ø)

... and 3 files with indirect coverage changes

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[PSchmiedmayer]

Looks great; thank you! 🚀