fix(spectral_editor): Fix procedural audio and add color-coded curves

Fixed three issues reported during testing:

1. Procedural audio now audible:
   - Added AMPLITUDE_SCALE=10.0 to match DCT coefficient magnitudes
   - Amplitude range 0-1 from Y-position now scaled to proper spectral levels

2. Procedural spectrogram now visible:
   - Each curve rendered separately with its own color
   - Normalized intensity calculation (specValue / 10.0)
   - Only draw pixels with intensity > 0.01 for performance

3. Color-coded curves:
   - Each curve assigned unique color from palette (8 colors cycling)
   - Colors: Blue, Green, Orange, Purple, Cyan, Brown, Pink, Gold
   - Control points and paths use curve color
   - Curve list shows color indicator dot
   - Procedural spectrogram uses curve colors for easy tracking

Visual improvements:
- Selected curves have thicker stroke (3px vs 2px)
- Each curve contribution visible in separate color
- Color dots in sidebar for quick identification

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

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