Add badge price tag controls: position, size, ribbon & digit colors

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>

css/style.css

@@ -4214,6 +4214,44 @@ select {
     margin-top: 6px;
 }
 
+.badge-color-row {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 8px;
+    align-items: center;
+    margin-top: 4px;
+}
+
+.badge-color-swatch {
+    width: 28px;
+    height: 28px;
+    border-radius: 50%;
+    border: 2px solid transparent;
+    padding: 0;
+    cursor: pointer;
+    box-shadow: 0 0 0 1px rgba(0,0,0,0.1) inset;
+    transition: transform 0.12s ease, border-color 0.12s ease;
+}
+
+.badge-color-swatch:hover {
+    transform: scale(1.08);
+}
+
+.badge-color-swatch.active {
+    border-color: #007AFF;
+    box-shadow: 0 0 0 2px rgba(0, 122, 255, 0.25);
+}
+
+.badge-color-row input[type="color"] {
+    width: 36px;
+    height: 30px;
+    border: 1px solid var(--border-color);
+    border-radius: 8px;
+    background: transparent;
+    cursor: pointer;
+    padding: 2px;
+}
+
 .badge-actions {
     display: flex;
     flex-wrap: wrap;