fix: persist server preference

[justinhartman]

Summary

• remember the viewer's chosen server in cookies/local storage and thread the preference through the controller response
• allow buildSources to honour a preferred server and expand the unit coverage around the new option
• update the view templates to carry the preference key and add a smarter footer script that restores the saved server on load

Testing

• yarn test
• npx yarn@1.22.22 test:coverage

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
imdb-app	Ready	Preview	Comment	Oct 20, 2025 3:16pm

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (e7e8bc6) to head (25e9483).
⚠️ Report is 9 commits behind head on develop.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop       #54   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           18        18           
  Lines         1627      1650   +23     
  Branches       130       135    +5     
=========================================
+ Hits          1627      1650   +23     

Flag	Coverage Δ
tests	100.00% <100.00%> (ø)

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