Use ghost buttons for turn navigation to blend with top bar

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/web/src/components/turn-navigation.tsx

@@ -23,7 +23,7 @@ export function TurnNavigation({
 	return (
 		<div className="card-glow flex items-center gap-3 rounded-lg border border-border bg-card px-4 py-3">
 			<Button
-				variant="outline"
+				variant="ghost"
 				size="icon"
 				onClick={onRetreatTurn}
 				disabled={!hasCombatants || isAtStart}
@@ -53,7 +53,7 @@ export function TurnNavigation({
 					className="text-muted-foreground"
 				/>
 				<Button
-					variant="outline"
+					variant="ghost"
 					size="icon"
 					onClick={onAdvanceTurn}
 					disabled={!hasCombatants}