setup goldens_test and init guest page golden

[tbm98]

progress for #8

[codecov]

Codecov Report

Merging #10 (f8991f3) into main (c2971e5) will increase coverage by 1.28%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #10      +/-   ##
==========================================
+ Coverage   24.71%   26.00%   +1.28%     
==========================================
  Files          40       40              
  Lines         700      700              
==========================================
+ Hits          173      182       +9     
+ Misses        527      518       -9     

Impacted Files	Coverage Δ
lib/src/ui/screens/guest/guest_page.dart	76.92% <0.00%> (+69.23%)	⬆️

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