fix(webxr): align input replays across XR sessions

[yanziz-nvidia]

Description

Client-side input recordings are stored in the active R3F scene reference space. A new XR session may establish a different origin even when both sessions use the same reference-space type, so replaying the stored coordinates directly can shift the hand trajectory.

This change:

• stores an optional gravity-aligned viewer pose with new version 1 recordings;
• computes a recorded-scene to current-scene translation and yaw transform on the first replay frame of each XR session;
• freezes and reuses that alignment for the rest of the session, while invalidating it when the reference space resets;
• preserves identity alignment for direct replay in the same reference space;
• keeps legacy version 1 JSON recordings compatible (they replay with the existing spatial behavior);
• applies the same spatial alignment to frame-paced and time-paced replay.

Calibration assumption: the headset must be at the same physical calibration pose at recording start and when replay first starts in a new XR session. Without a shared world marker or tracked table pose, the client cannot distinguish origin drift from the operator physically moving the headset.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Testing

• npm test -- --runInBand — 7 suites, 109 tests passed
• npm test -- --runInBand src/xrInputRecorder.test.ts — 36 tests passed
• targeted ESLint and Prettier checks for the changed recorder files
• SKIP=check-copyright-year pre-commit run --all-files — passed

Checklist

• I have read and understood the contribution guidelines
• I have run the linter and formatter with SKIP=check-copyright-year pre-commit run --all-files
• Documentation impact was covered with code comments and this PR description; no user-facing configuration was added
• I have added tests that prove my fix/feature works
• I have signed off all my commits (git commit -s) per the DCO

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