Add exotic palettes, pattern generator, and layout improvements
- 17 new exotic palettes: hieroglyph, cuneiform, thai, arabic, devanagari,
ethiopic, georgian, tibetan, alchemical, dominos, mahjong, dingbats,
playing cards, yijing, box drawing, math symbols, flora, weather
- Pattern generator with 10 types: plasma, mandelbrot, spiral, waves,
nebula, kaleidoscope, aurora, lava, crystals, fractal_tree
- Random pattern button with rainbow gradient
- Mode tabs (Image / Patterns) in controls bar
- Preview area now fills full viewport (header/footer hidden)
- Slimmer controls bar
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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