Compact expandable palette display (litmus-3fax)
Collapse ANSI palette into horizontal strip that expands on click. Gets palette out of the way so scene is front and center.
Summary of Changes
Replaced the full color palette on the detail page with a compact expandable palette. Compact mode shows a single row of swatches (bg, fg, cursor + ANSI strip). Clicking expands to show full detail with selection colors, labeled ANSI grid (8x2), and hex values. Driven by use_signal toggle.