Dashboard terminal recording support with manual controls and extensible recorder API

[mitchdenny]

Feature request

Add first-class terminal session recording support in the Aspire dashboard, backed by the existing Hex1b asciinema recording capability.

User experience goal

Provide built-in manual controls in the dashboard to:

1. Start recording from the terminal UI.
2. Stop recording.
3. Download/save the resulting recording file locally.

Why this is useful

• Makes it easier to file actionable bugs for terminal emulation issues.
• Helps users capture/share sessions for their own troubleshooting and demos.

API direction

Consider introducing an ITerminalRecorder API (via DI) so apps/extensions can programmatically trigger recordings in addition to manual UI controls.

Design considerations

• Keep room in the API/model for multiple recordings per session/resource.
• Track prior recordings for potential future dashboard features like selection/playback.
• Consider integration points with telemetry download workflows.

Scope notes

• Manual start/stop/download in dashboard should be built-in.
• Programmatic triggering via DI should be extensible without requiring dashboard UI customization.

Backlog

Track as backlog work.