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/stat-block-panel.tsx

@@ -155,7 +155,7 @@ function DesktopPanel({
 	return (
 		<div
 			className={cn(
-				"fixed top-0 bottom-0 flex w-[400px] flex-col border-border bg-card transition-slide-panel",
+				"panel-glow fixed top-0 bottom-0 flex w-[400px] flex-col border-border bg-card transition-slide-panel",
 				sideClasses,
 				isCollapsed ? collapsedTranslate : "translate-x-0",
 			)}
@@ -201,7 +201,7 @@ function MobileDrawer({
 			/>
 			<div
 				className={cn(
-					"absolute top-0 right-0 bottom-0 w-[85%] max-w-md border-border border-l bg-card shadow-xl",
+					"panel-glow absolute top-0 right-0 bottom-0 w-[85%] max-w-md border-border border-l bg-card",
 					!isSwiping && "animate-slide-in-right",
 				)}
 				style={