Cast HLS streams correctly on Chromecast

[leandroalonso]

Fixes PCIOS-812

Makes Chromecast cast HLS streams correctly. Builds on the HLS audio/video toggle work.

To test

Note

Requires a real Chromecast device.

2. Play an episode with an HLS stream that contains video.
3. Cast to a Chromecast (video-capable, e.g. a TV).
4. Confirm playback starts on the device and shows video
5. Also cast a regular (non-HLS) audio episode and a video podcast to confirm no regression.

Checklist

• I have considered if this change warrants user-facing release notes and have added them to CHANGELOG.md if necessary.
• I have considered adding unit tests for my changes.
• I have updated (or requested that someone edit) the Event Horizon schema to reflect any new or changed analytics.

[Copilot]

Pull request overview

Fixes Chromecast playback for episodes delivered via HLS manifests by ensuring the Cast receiver is given the correct media classification and MIME type, so video-capable HLS streams render as video instead of audio-only.

Changes:

• Treat streamed HLS episodes as video for Google Cast metadata (.movie) to encourage video rendering on the receiver.
• Set Cast contentType to the HLS MIME type when casting an HLS manifest URL.
• Expose Episode.hlsEnclosureType publicly from PocketCastsDataModel so the app target can reuse the canonical MIME type constant.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
podcasts/Google Cast/GoogleCastManager.swift	Detect HLS streaming and adjust Cast metadata type + content MIME type accordingly.
Modules/Sources/PocketCastsDataModel/Public/Model/Episode+fromDictionary.swift	Makes hlsEnclosureType public so it can be referenced by the app module when building Cast media info.

[SergioEstevao]