feat: contractor link for courier contracts

[ErikKalkoken]

Resolves #308

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 40.6%. Comparing base (148ad19) to head (fe0790b).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/app/ui/contracts.go	0.0%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #310     +/-   ##
=======================================
+ Coverage   38.8%   40.6%   +1.7%     
=======================================
  Files        223     223             
  Lines      38597   34087   -4510     
=======================================
- Hits       15007   13849   -1158     
+ Misses     21689   18337   -3352     
  Partials    1901    1901             

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