[codex] Use WebUSB for Android Chrome USB connections

[cormoran]

Summary

• Add a WebUSB CDC transport that claims a CDC bulk data interface and exposes it through the existing ZMK Studio RPC transport shape.
• Route the existing USB connection action to WebUSB automatically on Android Chrome while keeping Web Serial for other browsers.
• Allow the existing USB connection notice to continue on Android Chrome when WebUSB is available, with tests for the transport selection and dialog behavior.

Verification

• npm run format:check
• npm run lint
• npm run build
• npm test -- --runInBand

Notes

• gh auth status reports the local gh token is invalid, so PR creation used the GitHub connector after pushing with git/SSH.

[github-actions]

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_{Deployed from commit 53cf0d8}