Adds four new controls to the digital-badge price tag so users can fine
-tune the look: a vertical position slider (raises/lowers the band
within the circle), a size slider (60-160% of the default band scale),
and two color rows for the ribbon and the digits — each with six
preset swatches plus a native color picker for custom colors.
Per-item state (priceY, priceSize, priceBg, priceFg) is preserved
across selections and renders consistently in the 240x240 export.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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