refactor: use shadow theme tokens, remove ProjectCard translate-hover

Replace inline var(--blue) arbitrary shadow values with typed theme
tokens (shadow-brutal-xl, shadow-brutal-2xl). Remove translate on
ProjectCard hover — shadow-only interaction is less distracting in
a dense grid layout.

src/entities/project/ui/ProjectCard/ProjectCard.tsx

@@ -30,12 +30,7 @@ type Props = {
  */
 export function ProjectCard({ title, year, description, tags, imageUrl }: Props) {
   return (
-    <Card
-      className={cn(
-        'group hover:translate-x-[2px] hover:translate-y-[2px]',
-        'hover:shadow-[10px_10px_0_var(--blue)] transition-all duration-300',
-      )}
-    >
+    <Card className={cn('group hover:shadow-brutal-xl transition-shadow duration-300')}>
       <CardHeader>
         <div className="flex flex-row justify-between items-start mb-3">
           <CardTitle className="flex-1">{title}</CardTitle>