fix(mq_editor): jitter + central spectrum invalidation

mq_synth.js:
- jitter was only used as a static initial phase offset (inaudible);
  now drives per-sample LCG frequency perturbation (±jitter fraction of
  instantaneous freq) in both sinusoidal (integratePhase path) and
  resonator modes (separate jitterSeed, independent from noise excitation)
- disableJitter option now correctly gates jitter to 0 in both modes
  (was never read before)

viewer.js / app.js:
- remove invalidatePartialSpectrum() and onResonatorParamChange callback;
  replace with viewer.onGetSynthOpts callback, called inside
  _computePartialSpectrum to pull fresh synthOpts at compute time
- all UI changes (resonator r/gain, forceResonator, globalR/gain,
  forceRGain, sinusoidal params) now use viewer.render() as the single
  invalidation path — no more split between render() and
  invalidatePartialSpectrum()

handoff(Gemini): jitter active on both synth modes; spectrum always sees
fresh synthOpts via onGetSynthOpts; viewer.render() is the only
invalidation path needed.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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