Add camera control properties (pan, tilt, zoom) to DOM media track types

[Copilot]

The MediaStream camera-control constrainable properties (pan, tilt, zoom, torch, whiteBalanceMode) were missing from the media-track types in lib.dom.d.ts, so browser-supported camera control was unusable without casts:

const track = stream.getVideoTracks()[0];
const caps = track.getCapabilities();
if (caps.zoom) {                                    // TS2339
    await track.applyConstraints({ advanced: [{ zoom: caps.zoom.max }] }); // TS2353
}

Changes

• MediaTrackCapabilities: added pan, tilt, zoom (DoubleRange), torch (boolean[]), whiteBalanceMode (string[])
• MediaTrackConstraintSet: added pan, tilt, zoom (ConstrainDouble), torch (ConstrainBoolean), whiteBalanceMode (ConstrainDOMString)
• MediaTrackSettings: added pan, tilt (number); zoom/torch/whiteBalanceMode already existed
• MediaTrackSupportedConstraints: added pan, tilt, zoom, torch, whiteBalanceMode (boolean)
• New compiler test mediaTrackPanTiltZoom.ts + baselines covering all four interfaces

Note: lib.dom.d.ts is generated by TypeScript-DOM-lib-generator; a matching upstream change is needed so this isn't lost on the next lib sync.

• Fixes MediaStream API should support pan, zoom and tilt #56589