Restyle dark theme with blue-tinted palette, card glow, and rounded surfaces

Shift the dark theme from neutral gray to a richer blue-tinted palette
inspired by CharBuilder-style TTRPG apps. Deeper navy background, steel-blue
card surfaces, and visible blue borders create more depth and visual layering.

- Update design tokens: background, card, border, input, muted colors
- Add card-glow utility (radial gradient + blue box-shadow) for card surfaces
- Add panel-glow utility (top-down gradient) for tall panels like stat blocks
- Apply glow and rounded-lg to all card surfaces, dropdowns, dialogs, toasts
- Give outline buttons a subtle fill instead of transparent background
- Active combatant row now uses full border with glow instead of left accent

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

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

@@ -21,7 +21,7 @@ export function TurnNavigation({
 	const activeCombatant = encounter.combatants[encounter.activeIndex];
 
 	return (
-		<div className="flex items-center gap-3 rounded-md border border-border bg-card px-4 py-3">
+		<div className="card-glow flex items-center gap-3 rounded-lg border border-border bg-card px-4 py-3">
 			<Button
 				variant="outline"
 				size="icon"