Changes price-tag defaults to priceY=9 and priceSize=60% (was 0/100)
per real-world feedback — the band sits a bit lower and is more
compact by default. Adds three nickname controls mirroring the price-
tag ones: text size slider (60-160%), edge-offset slider (0-30% inset
from the circle edge, default 14%), and a color row with six preset
swatches plus a native color picker for custom colors. The legacy
white/black radio is gone; existing items with "white"/"black" values
are migrated to hex on first render. Shadow color now auto-flips based
on text brightness so any color stays readable.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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