feat(webapp): push the session events log next to the recording

[irvingouj@Devolutions (irvingoujAtDevolution)]

Adds SessionEventsRecorder to @devolutions/web-recorder. It pushes the session events log next to the recording:

• session.start with locale and mediaStartTime when it starts
• session.end when it stops

It uses /jet/jrec/push/{id}?fileType=slog&artifact=events, on a push URL with its own push token, never the media recorder's. Gateway never changes this log. Its AI analysis is a separate log written in that locale; mediaStartTime lets a caller put both on the media timeline.

WebMRecorder and AsciiCastV2Recorder now expose mediaStartTime so the caller can pass it in. Start the events recorder after the media recorder: Gateway refuses an events push before the recording starts, and an older Gateway refuses only the events push while the media push is connected. Gateway checks the session once the socket is open, so such a refusal resolves start() and then ends the push; isRecording tells.

await webm.start(canvas, recordingUrl);
await events.start(eventsPushUrl, { mediaStartTime: webm.mediaStartTime!, locale: 'fr-CA' });
// ...
events.stop();
webm.stop();

Needs the Gateway side: #2117.

Tests: tsc and biome only, no browser test.

🤖 Generated with Claude Code

[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

[Copilot]

🟡 Changes recommended

Startup cancellation, reconnect sequencing, and failure reporting have unresolved correctness issues.

3 open issues

• Restart resets sequence numbers in the same session log · New
• Post-start push failures are invisible to callers · New
• stop() leaves connecting start() promise pending · New

What changed in this PR

Adds session-event recording alongside media uploads, using Gateway’s events-artifact support from #2117.

Changes:

• Adds SessionEventsRecorder to send session start/end events and timeline metadata.
• Exposes media start times from both media recorders.
• Exports the new recorder and options.

File	Description
webapp/​packages/​web-recorder/​src/​webm-recorder.ts	Tracks and exposes video start time.
webapp/​packages/​web-recorder/​src/​session-events-recorder.ts	Uploads session lifecycle events over WebSocket.
webapp/​packages/​web-recorder/​src/​index.ts	Exports the session-events API.
webapp/​packages/​web-recorder/​src/​asciicast-v2-recorder.ts	Exposes terminal recording start time.

_{Review effort: Balanced}