Add runtime AV1 hardware decode detection

[alexeichhorn]

Detect AV1 hardware support at runtime. This means we find more isNativelyPlayable streams on AV1-capable devices.

[coderabbitai]

📝 Walkthrough

Walkthrough

This change introduces AV1 hardware decoding detection to the VideoCodec model by adding a private static property that queries VideoToolbox availability and platform support. The implementation replaces a hardcoded false value with runtime checks for iOS 13.0+, macOS 10.15+, and tvOS 13.0+.

Changes

Cohort / File(s)	Summary
AV1 Hardware Decode Support Sources/YouTubeKit/Models/Codecs.swift	Added private static property isAV1HardwareDecodeSupported with conditional VideoToolbox import and platform-specific runtime availability checks (iOS 13.0+, macOS 10.15+, tvOS 13.0+). Delegated VideoCodec.isNativelyPlayable.av1 to use the new property instead of returning false unconditionally.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The PR title accurately reflects the main change: adding runtime detection for AV1 hardware decode support instead of hard-coding it as unavailable.
Description check	✅ Passed	The PR description is directly related to the changeset, explaining the purpose of detecting AV1 hardware support at runtime to identify more playable streams.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@Sources/YouTubeKit/Models/Codecs.swift`:
- Around line 82-89: The availability check for kCMVideoCodecType_AV1 is too
permissive; update the guard in the isAV1HardwareDecodeSupported closure so the
runtime/compile-time availability matches the constant's introduction: keep the
canImport(VideoToolbox) check, and change the `#available` condition around the
VTIsHardwareDecodeSupported(kCMVideoCodecType_AV1) call to iOS 17.0, macOS 14.0,
and tvOS 17.0 to ensure kCMVideoCodecType_AV1 is present when referenced; leave
the fallback return false in place if the platform/SDK isn't available.