Fix concentration glow clipping at container edges

Add padding to the inner combatant list container so the box-shadow glow
from the concentration-damage animation renders fully on all sides,
preventing clipping by the scrollable parent's implicit overflow-x.

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

apps/web/src/App.tsx

@@ -155,7 +155,7 @@ export function App() {
 
 				{/* Scrollable area — combatant list */}
 				<div className="flex-1 overflow-y-auto min-h-0">
-					<div className="flex flex-col pb-2">
+					<div className="flex flex-col px-2 py-2">
 						{encounter.combatants.length === 0 ? (
 							<p className="py-12 text-center text-sm text-muted-foreground">
 								No combatants yet — add one to get started