Set transcription table to multi-select

[chidiwilliams]

Resolves #310

[codecov]

Codecov Report

Merging #340 (8a2bc34) into main (70ad8f9) will increase coverage by 4.51%.
The diff coverage is 84.09%.

@@            Coverage Diff             @@
##             main     #340      +/-   ##
==========================================
+ Coverage   78.11%   82.63%   +4.51%     
==========================================
  Files           8        8              
  Lines        1595     1601       +6     
==========================================
+ Hits         1246     1323      +77     
+ Misses        349      278      -71     

Flag	Coverage Δ
Windows	?
macOS	82.63% <84.09%> (+4.76%)	⬆️

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Impacted Files	Coverage Δ
buzz/transcriber.py	78.27% <0.00%> (+2.93%)	⬆️
buzz/model_loader.py	69.15% <50.00%> (-0.37%)	⬇️
buzz/gui.py	85.25% <90.00%> (+6.00%)	⬆️
buzz/recording.py	80.00% <0.00%> (+12.00%)	⬆️

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