Fix compatibility with latest AirPlay

[jlacivita]

Summary

• Fixed play_url to work with the latest AirPlay protocol changes

Test plan

• Manually tested play_url against AppleTV and Samsung Frame 2025

[robkochman]

I reworked this approach against current master and published the result at
robkochman:codex/play-url-tvos26,
commit 8144c77c.

The revised implementation keeps the modern /command queue flow while:

• using stream-specific identifiers and headers;
• driving playback completion from event-channel state transitions;
• waiting for a real startup transition instead of treating the first state as success;
• avoiding the unrelated dependency churn and raw protocol logging; and
• adding regression coverage for the queue commands and playback state handling.

Validation completed:

• full suite: 1255 passed, 6 skipped;
• Black, isort, Flake8, mypy, and Pylint all pass;
• live tvOS 26.5 tests: remote HLS, local HLS, and local progressive MP4 all reached
  playing; local media then reached stopped/ended normally; and
• an H.264/AAC visual announcement with embedded audio completed successfully through
  an application wrapper.

I do not have permission to update this PR's source branch directly, so I am linking
the tested branch for the author or maintainers to compare or cherry-pick.