feat: improve rhythm accuracy using Tone.Transport

[vyagh]

Summary

This PR improves the rhythmic precision of MusicBlocks by integrating Tone.Transport into the runFromBlock execution flow. Previously, the engine relied solely on setTimeout for scheduling, which would cause audible timing drift and jitter during complex musical sequences.

The engine now checks if Tone.Transport is running. If so, it schedules block execution on the high-precision audio clock using scheduleOnce. It falls back to the standard setTimeout behavior when the transport is stopped or unavailable, maintaining backward compatibility.

Verification

Automated Tests:

• Passed npm test, ensuring no regressions in existing logic.
• New test suite js/tests/logo_timing.test.js passed, confirming the conditional logic for timer switching.

Manual Verification:

• Verified in the browser that the usingToneTimer flag toggles to true when a block is executed while the audio transport is active.
• Verified that execution halts correctly when using the Stop button for the cleanup logic

[github-actions]

✅ All Jest tests passed! This PR is ready to merge.

[github-actions]

✅ All Jest tests passed! This PR is ready to merge.