Polish UI: consistent icon buttons, tooltips, modal backdrop close, and top bar layout

- Standardize icon button sizing (size="icon") and color (text-muted-foreground) across top and bottom bars
- Group bottom bar icon buttons with gap-0 to match top bar style
- Add missing tooltips/aria-labels for stat block viewer, bulk import buttons
- Replace Settings icon with Library for source manager
- Make step forward/back buttons use primary (solid) variant
- Move round badge next to combatant name in center of top bar
- Close player create/edit and management modals on backdrop click

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

apps/web/src/components/player-management.tsx

@@ -28,8 +28,16 @@ export function PlayerManagement({
 	if (!open) return null;
 
 	return (
-		<div className="fixed inset-0 z-50 flex items-center justify-center bg-black/50">
-			<div className="w-full max-w-md rounded-lg border border-border bg-card p-6 shadow-xl">
+		// biome-ignore lint/a11y/noStaticElementInteractions: backdrop click to close
+		<div
+			className="fixed inset-0 z-50 flex items-center justify-center bg-black/50"
+			onMouseDown={onClose}
+		>
+			{/* biome-ignore lint/a11y/noStaticElementInteractions: prevent close when clicking modal content */}
+			<div
+				className="w-full max-w-md rounded-lg border border-border bg-card p-6 shadow-xl"
+				onMouseDown={(e) => e.stopPropagation()}
+			>
 				<div className="mb-4 flex items-center justify-between">
 					<h2 className="text-lg font-semibold text-foreground">
 						Player Characters