Add chat export functionality

[jdisho]

Add chat export functionality

♻️ Current situation & Problem

Without a chat export feature, users cannot save or reference their conversation history, leading to lost information and manual copy-pasting workarounds.

⚙️ Release Notes

Added a feature to export chat conversations in text format.

📚 Documentation

N/A

✅ Testing

N/A

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 1 line in your changes missing coverage. Please review.

Project coverage is 43.84%. Comparing base (59b59ef) to head (a333a58).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
.../MultipleResources/MultipleResourcesChatView.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
+ Coverage   40.44%   43.84%   +3.40%     
==========================================
  Files          31       31              
  Lines        1422     1419       -3     
==========================================
+ Hits          575      622      +47     
+ Misses        847      797      -50     

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]

Thank you @jdisho!