Port web client perf updates from cloudxr-js 6.2.0

[yanziz-nvidia]

depends on #528

• Port the canvas-backed performance metrics panel from the upstream cloudxr-js sample: replace the per-frame uikit Container/Text tree in CloudXRUI.tsx with a single PerformanceCanvasImage to avoid uikit layout recalcs every frame while the panel is open in XR.
• Updates shared dependency
• Bumps telemetry to 6.2.0 to match 6.2.0 SDK target

Test plan

• npm install && npm run build succeeds in deps/cloudxr/webxr_client/.
• CI Build CloudXR Web Client action resolves 6.2.0-rc4 from private NGC.
• Launch a WebXR session, open the in-XR control panel, confirm the Render FPS / Streaming FPS / Pose-to-Render values update each frame and look correct.
• Toggle Headless from the 2D UI and confirm the per-frame WebGL path remains skipped.
• Sanity-check non-XR pages render with the new three/r3f versions.

Summary by CodeRabbit

• New Features

  • Added a visual performance metrics panel displaying render FPS, streaming FPS, and pose-to-render metrics in real-time.

• Chores

  • Version updated to 6.2.0.
  • Updated runtime and development dependencies.

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🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main changes: updating the web client performance metrics from cloudxr-js 6.2.0, including new PerformanceCanvasImage component, version bump from 6.1.0 to 6.2.0, and dependency updates.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch yanziz/cxr-js-client-update

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[yanziz-nvidia]

/preview-docs