Stabilize turn navigation bar layout with CSS grid

Use a three-column grid (1fr / auto / 1fr) so the active combatant
name stays centered while round badge and difficulty indicator are
anchored in the left and right zones. Prevents layout jumps when
the name changes between turns.

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

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

@@ -80,7 +80,7 @@ describe("TurnNavigation", () => {
 			expect(container.textContent).not.toContain("\u2014");
 		});
 
-		it("round badge and combatant name are siblings in the center area", () => {
+		it("round badge is in the left zone and name is in the center zone", () => {
 			renderNav(
 				buildEncounter({
 					combatants: [buildCombatant({ name: "Goblin" })],
@@ -88,7 +88,8 @@ describe("TurnNavigation", () => {
 			);
 			const badge = screen.getByText("R1");
 			const name = screen.getByText("Goblin");
-			expect(badge.closest(".flex")).toBe(name.parentElement);
+			// Badge and name are in separate grid cells to prevent layout shifts
+			expect(badge.parentElement).not.toBe(name.parentElement);
 		});
 	});
 

apps/web/src/components/combatant-row.tsx

@@ -430,7 +430,7 @@ function concentrationIconClass(
 	dimmed: boolean,
 ): string {
 	if (!isConcentrating)
-		return "opacity-0 group-hover:opacity-50 text-muted-foreground";
+		return "opacity-0 pointer-coarse:opacity-50 group-hover:opacity-50 text-muted-foreground";
 	return dimmed ? "opacity-50 text-purple-400" : "opacity-100 text-purple-400";
 }
 

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

@@ -26,19 +26,19 @@ export function TurnNavigation() {
 	const activeCombatant = encounter.combatants[encounter.activeIndex];
 
 	return (
-		<div className="card-glow flex items-center gap-3 border-border border-b bg-card px-4 py-3 sm:rounded-lg sm:border">
+		<div className="card-glow grid grid-cols-[1fr_minmax(0,auto)_1fr] items-center border-border border-b bg-card px-2 py-3 sm:rounded-lg sm:border sm:px-4">
-			<Button
+			{/* Left zone: navigation + history + round */}
-				variant="ghost"
-				size="icon"
-				onClick={retreatTurn}
-				disabled={!hasCombatants || isAtStart}
-				title="Previous turn"
-				aria-label="Previous turn"
-			>
-				<StepBack className="h-5 w-5" />
-			</Button>
-
 			<div className="flex items-center gap-1">
+				<Button
+					variant="ghost"
+					size="icon"
+					onClick={retreatTurn}
+					disabled={!hasCombatants || isAtStart}
+					title="Previous turn"
+					aria-label="Previous turn"
+				>
+					<StepBack className="h-5 w-5" />
+				</Button>
 				<Button
 					variant="ghost"
 					size="icon"
@@ -59,21 +59,24 @@ export function TurnNavigation() {
 				>
 					<Redo2 className="h-4 w-4" />
 				</Button>
+				<span className="ml-1 rounded-md bg-muted px-2 py-0.5 font-semibold text-foreground text-sm tabular-nums">
+					R{encounter.roundNumber}
+				</span>
 			</div>
 
-			<div className="flex min-w-0 flex-1 items-center justify-center gap-2 text-sm">
+			{/* Center zone: active combatant name */}
-				<span className="shrink-0 rounded-md bg-muted px-2 py-0.5 font-semibold text-foreground text-sm">
+			<div className="min-w-0 px-2 text-center text-sm">
-					<span className="-mt-[3px] inline-block">
-						R{encounter.roundNumber}
-					</span>
-				</span>
 				{activeCombatant ? (
 					<span className="truncate font-medium">{activeCombatant.name}</span>
 				) : (
 					<span className="text-muted-foreground">No combatants</span>
 				)}
+			</div>
+
+			{/* Right zone: difficulty + destructive + forward */}
+			<div className="flex items-center justify-end gap-1">
 				{difficulty && (
-					<div className="relative">
+					<div className="relative mr-1">
 						<DifficultyIndicator
 							result={difficulty}
 							onClick={() => setShowBreakdown((prev) => !prev)}
@@ -85,9 +88,6 @@ export function TurnNavigation() {
 						) : null}
 					</div>
 				)}
-			</div>
-
-			<div className="flex flex-shrink-0 items-center gap-3">
 				<ConfirmButton
 					icon={<Trash2 className="h-5 w-5" />}
 					label="Clear encounter"