Center action bar in empty state for better onboarding UX

Replace the abstract + icon with the actual input field centered at the
optical center when no combatants exist. Animate the transition in both
directions: settling down when the first combatant is added, rising up
when all combatants are removed.

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

apps/web/src/components/action-bar.tsx

@@ -32,6 +32,7 @@ interface ActionBarProps {
 	playerCharacters?: readonly PlayerCharacter[];
 	onAddFromPlayerCharacter?: (pc: PlayerCharacter) => void;
 	onManagePlayers?: () => void;
+	autoFocus?: boolean;
 }
 
 function creatureKey(r: SearchResult): string {
@@ -50,6 +51,7 @@ export function ActionBar({
 	playerCharacters,
 	onAddFromPlayerCharacter,
 	onManagePlayers,
+	autoFocus,
 }: ActionBarProps) {
 	const [nameInput, setNameInput] = useState("");
 	const [suggestions, setSuggestions] = useState<SearchResult[]>([]);
@@ -260,6 +262,7 @@ export function ActionBar({
 						onKeyDown={handleKeyDown}
 						placeholder="+ Add combatants"
 						className="max-w-xs"
+						autoFocus={autoFocus}
 					/>
 					{hasSuggestions && (
 						<div className="absolute bottom-full z-50 mb-1 w-full max-w-xs rounded-md border border-border bg-card shadow-lg">