Test mobile hand release-to-cast integration

[parthmishra]

Summary

• add a mobile PlayerHand integration test that drives the production hold, lift, and release gesture
• assert that one engine-provided direct PlayLand action dispatches exactly that action
• assert that an ambiguous play-plus-ability bucket never becomes cast-ready, dispatches nothing, and retains the tap-to-open hand modal fallback

Why

Follow-up to #6518. A maintainer requested production-path coverage after that PR had already entered its merge window. The test-only commit reached the fork immediately after #6518 merged, so this small follow-up carries the requested regression coverage onto the merged implementation.

Validation

• focused hand gesture and action-choice suite: 3 files passed, 31 tests passed
• TypeScript project check passed
• ESLint passed for the new test
• git diff --check passed

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[matthewevans]

Deferred by maintainer intake policy — not ignored.

This current head (5d80ac353b6703efdde37e4685919dadbd3844c1) was triaged as a frontend-only change (client/src/components/hand/__tests__/PlayerHand.mobileGesture.test.tsx) by parthmishra. The local frontend-review allowlist does not include this author, so this route does not perform an implementation-diff review or approve the PR.

A maintainer must explicitly take this PR or add a local frontend-review exception before it can receive substantive review. The defer label is a routing marker only, not a verdict on the change.