Replaced text input with a clickable 24-icon grid picker for the side
panel. Icons are curated for plating (flask, blast, mask, rinse, bake,
plate, inspect, etc.). When adding a new step, the icon is automatically
guessed from the name via keyword matching (e.g. "Masking" → paint-brush,
"Oven baking" → fire, "Acid Dip" → flask).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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