Add cinema mode toggle

[justinhartman]

Summary

• add a cinema toggle button next to series navigation controls
• implement cinema layout styling to stack player, episodes, seasons, and info when enabled
• hook up client-side logic to swap layouts and update the toggle label

Testing

• CI=true yarn test --coverage --runInBand

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Codex Task

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
imdb-app	Ready	Preview	Comment	Nov 23, 2025 0:15am

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (33c25f6) to head (db86e84).
⚠️ Report is 4 commits behind head on develop.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop       #57   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           18        18           
  Lines         1650      1650           
  Branches       135       135           
=========================================
  Hits          1650      1650           

Flag	Coverage Δ
tests	100.00% <ø> (ø)

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