feat(webapp): play session-protocol WebM streams

[irvingouj@Devolutions (irvingoujAtDevolution)]

The shadow player now understands Segment started, queued Pulls, and Stream ended so live clips can reconnect and change size on one websocket.

Co-authored-by: Copilot 223556219+Copilot@users.noreply.github.com

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[github-actions]

Let maintainers know that an action is required on their side

• Add the label release-required Please cut a new release (Devolutions Gateway, Devolutions Agent, Jetsocat, PowerShell module) when you request a maintainer to cut a new release (Devolutions Gateway, Devolutions Agent, Jetsocat, PowerShell module)

• Add the label release-blocker Follow-up is required before cutting a new release if a follow-up is required before cutting a new release

• Add the label publish-required Please publish libraries (`Devolutions.Gateway.Utils`, OpenAPI clients, etc) when you request a maintainer to publish libraries (Devolutions.Gateway.Utils, OpenAPI clients, etc.)

• Add the label publish-blocker Follow-up is required before publishing libraries if a follow-up is required before publishing libraries

[irvingouj@Devolutions (irvingoujAtDevolution)]

Implementation notes:

• shadow-player parses Segment started JSON, implicit segment end, and Stream ended.
• Pull is sent before MSE append so the Gateway can pipeline the next chunk.
• Playback controls and clip list are isolated so resolution/clip changes can swap SourceBuffers.
• recording-player WebM streamer is wired to the same protocol.

Note

LLM-assisted content (no human feedback).