build: interim commit of improved sample

[dwmkerr]

as well as much improved testing

TODO

• [x] fix test warnings / console output
• [x] fix 'unprocessed code blocks'
• [x] test on sample
• [x] test live
• [x] consider extracting xpath config

[codecov[bot]]

Codecov Report

Merging #17 (4f31a7d) into main (06e99f0) will increase coverage by 32.71%. The diff coverage is 84.37%.

@@             Coverage Diff             @@
##             main      #17       +/-   ##
===========================================
+ Coverage   12.37%   45.08%   +32.71%     
===========================================
  Files           7        5        -2     
  Lines         291      244       -47     
  Branches        7       11        +4     
===========================================
+ Hits           36      110       +74     
+ Misses        251      132      -119     
+ Partials        4        2        -2     

Impacted Files	Coverage Δ
src/content.ts	0.00% <0.00%> (ø)
src/lib/chatgpt-dom.ts	96.42% <96.42%> (ø)

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