Pitch Staircase: Frequency multiplies beyond audible range ($10^{38}\text{ Hz}$), breaking stair layout and audio

[karankumar1106]

Describe the Bug

In the Pitch Staircase widget (pitchstaircase.js), repeatedly clicking a stair with custom ratios (e.g. 7/4) causes frequencies to multiply exponentially up to $10^{38}\text{ Hz}$ (or drop below $10^{-38}\text{ Hz}$).

Observed Behavior

1. The stair table cell width shrinks into a 20px sliver.
2. Text overflows with scientific notation (1.044345e+38 C10).
3. Tone.js audio synth fails to play frequencies beyond the Nyquist / audible limit.

Proposed Solution

Add audible range validation in _dissectStair() ($20\text{ Hz} \le f \le 20,000\text{ Hz}$) with user notification feedback when boundaries are reached, accompanied by Jest unit test coverage.

I would be happy to submit a PR to fix this!