feat(ui): widen cards to a 2/3 column grid and add a disabled role

Two columns portrait and three landscape read better than 3/4 on a 320x480
panel. The new disabled palette role sits between face and muted, for a
control that is present but inactive.

lua/lib/ui.lua

@@ -75,6 +75,7 @@ local function palette(seed)
 		color = color(foreground),
 		muted = color(mix(foreground, background, 0.45)),
 		accent = color(accent),
+		disabled = color(mix(background, foreground, 0.25)),
 		face = color(mix(background, foreground, 0.08)),
 		pressedFace = color(accent),
 		pressedColor = color(background),
@@ -187,7 +188,7 @@ end
 ---@return integer side
 ---@return integer columns
 function ui.cardSide(count, pad, gap, reserve)
-	local columns = gui.getWidth() >= gui.getHeight() and 4 or 3
+	local columns = gui.getWidth() >= gui.getHeight() and 3 or 2
 	local rows = math.ceil(count / columns)
 	local byWidth = (gui.getWidth() - 2 * pad - (columns - 1) * gap) // columns
 	local byHeight = (gui.getHeight() - 2 * pad - (reserve or 0) - (rows - 1) * gap) // rows