Adding warning on possibly invalid API key

[raivisdejus]

Fix for #948

[codecov]

Codecov Report

Attention: Patch coverage is 63.63636% with 4 lines in your changes missing coverage. Please review.

Project coverage is 81.37%. Comparing base (b35267d) to head (cee26b7).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
buzz/widgets/openai_api_key_line_edit.py	60.00%	2 Missing ⚠️
...s/preferences_dialog/general_preferences_widget.py	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #950      +/-   ##
==========================================
+ Coverage   81.31%   81.37%   +0.05%     
==========================================
  Files          86       86              
  Lines        4865     4875      +10     
==========================================
+ Hits         3956     3967      +11     
+ Misses        909      908       -1     

Flag	Coverage Δ
Linux	80.90% <63.63%> (-0.01%)	⬇️
Windows	80.89% <63.63%> (?)
macOS	81.14% <63.63%> (-0.05%)	⬇️

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