Fix syntax error in StagePanel.tsx from merge conflict artifact

Remove duplicate inline-style JSX block that was left behind after a
merge, causing esbuild parse errors. Restore hasMergeFailure border and
background colors in the cardStyle object.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/components/StagePanel.tsx

@@ -169,11 +169,7 @@ export function StagePanel({
 						const borderColor = TYPE_COLORS[itemType];
 						const typeLabel = TYPE_LABELS[itemType];
 						const hasMergeFailure = Boolean(item.merge_failure);
-						return (
-							<div
-								key={`${title}-${item.story_id}`}
-								data-testid={`card-${item.story_id}`}
-								style={{
+						const cardStyle = {
 							border: hasMergeFailure
 								? "1px solid #6e1b1b"
 								: item.agent
@@ -187,16 +183,6 @@ export function StagePanel({
 									? "#161e2a"
 									: "#191919",
 							display: "flex",
-									flexDirection: "column",
-									gap: "2px",
-								}}
-							>
-						const cardStyle = {
-							border: item.agent ? "1px solid #2a3a4a" : "1px solid #2a2a2a",
-							borderRadius: "8px",
-							padding: "8px 12px",
-							background: item.agent ? "#161e2a" : "#191919",
-							display: "flex",
 							flexDirection: "column" as const,
 							gap: "2px",
 							width: "100%",