Move transcriptions to individual cache files

[chidiwilliams]

No description provided.

[codecov]

Codecov Report

Merging #519 (36bd268) into main (2dc0797) will increase coverage by 0.21%.
The diff coverage is 92.15%.

❗ Current head 36bd268 differs from pull request most recent head 980cdaf. Consider uploading reports for the commit 980cdaf to get more accurate results

@@            Coverage Diff             @@
##             main     #519      +/-   ##
==========================================
+ Coverage   75.87%   76.09%   +0.21%     
==========================================
  Files          34       34              
  Lines        2483     2518      +35     
==========================================
+ Hits         1884     1916      +32     
- Misses        599      602       +3     

Flag	Coverage Δ
Linux	75.77% <92.15%> (+0.18%)	⬆️
Windows	76.03% <91.66%> (+0.23%)	⬆️
macOS	74.10% <88.23%> (+0.24%)	⬆️

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Impacted Files	Coverage Δ
buzz/cache.py	88.46% <88.57%> (+0.46%)	⬆️
buzz/gui.py	76.34% <100.00%> (+0.07%)	⬆️
buzz/model_loader.py	71.60% <100.00%> (ø)
buzz/transcriber.py	87.98% <100.00%> (+0.07%)	⬆️
buzz/widgets/transcription_viewer_widget.py	98.73% <100.00%> (+0.04%)	⬆️

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