fix(theme-studio): make the color picker stand out from the page

The picker panel's background (#161412) sat a few shades off the page background (#0d0b0a), so it was hard to tell apart from the page. I gave it the studio's gold accent border (#e8bd30) and lifted the background to #1f1c19, both already used in the toolbar chrome, so the panel reads as a distinct surface. The #pickertest gate asserts the accent border and a per-channel background lift of at least 12 over the page, so the distinction can't quietly regress.

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