fix: persist server selection across sessions

[justinhartman]

Summary

• store preferred server selection in a cookie and feed it into source selection so reloads honor the viewer's choice
• update the view toggle to read/write the cookie and include the cookie name in rendered templates
• extend helper and controller specs to cover cookie parsing and preferred server handling across single and multi-domain cases

Testing

• yarn test
• yarn test:coverage

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
imdb-app	Ready	Preview	Comment	Oct 18, 2025 11:17am

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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 (3e0fefb).
⚠️ Report is 9 commits behind head on develop.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop       #55   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           18        18           
  Lines         1627      1670   +43     
  Branches       130       136    +6     
=========================================
+ Hits          1627      1670   +43     

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

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