EventPaletteStrip

Full-width band of an event edition's brand palette, left to right in authored order.

The ambient accent wash can only ever carry one color, and for editions whose primary is very dark (DEF CON's navy) it is nearly invisible against a dark surface — this strip is where the rest of the palette actually shows up. Used as a hairline rule under MainAppBar and as the closing edge of the EventInfoSheet header.

Draws nothing for an empty palette, and a flat band rather than a gradient when the edition publishes a single color.