test: stabilize YouTube client CI timeout

[devhims]

Problem / Motivation

The production Worker build after PR #63 failed because one YouTube client normalization test exceeded Vitest's generic 5-second timeout. The same test passes consistently when run alone.

Why it matters

Cloudflare stops the deployment when any test times out, even when the application code and the test assertions are correct.

What changed

The one load-sensitive unavailable-video normalization test now has a 15-second timeout. It intentionally parses an unavailable response across every player profile before returning the first response. Production code and test assertions are unchanged.

Tests

• The exact test passed 20 out of 20 focused runs before the change.
• All 25 tests in test/youtube-client.test.ts passed after the change.
• The complete file finished in 224 ms on the hotfix branch.

Manual verification

Merge this PR and confirm the production Cloudflare Worker build completes.

Screenshots / video

Not applicable. This is a test-runner timeout change.

Issue link

no linked issue: fixes the failed production deployment after PR #63.

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Project	Deployment	Actions	Updated
video2ctx-web	Ready	Preview	Sep 20, 2026 3:39pm UTC

[devhims]

Intent: Stop a load-sensitive YouTube client test from blocking production Worker deployments while keeping the same assertions and production behavior.
Not a goal: Change YouTube client fallback behavior or increase timeout limits for other tests.