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/ui/overflow-menu.tsx

@@ -49,7 +49,7 @@ export function OverflowMenu({ items }: OverflowMenuProps) {
 				<EllipsisVertical className="h-5 w-5" />
 			</Button>
 			{!!open && (
-				<div className="absolute right-0 bottom-full z-50 mb-1 min-w-48 rounded-md border border-border bg-card py-1 shadow-lg">
+				<div className="card-glow absolute right-0 bottom-full z-50 mb-1 min-w-48 rounded-lg border border-border bg-card py-1">
 					{items.map((item) => (
 						<button
 							key={item.label}