feat(ui): modern shadcn/ui theme with violet accent across all pages

Add shadcn/ui (Radix + Tailwind 4) components, zinc/violet theme tokens and self-hosted Inter. New header with user menu, Steam cover art, skeletons and toasts. Replace @mdi/font with lucide-react. Fix: top-owned list on the landing page only showed with top-played entries; numbers use the app language.

package.json

@@ -10,16 +10,22 @@
     "test": "vitest run"
   },
   "dependencies": {
+    "@fontsource-variable/inter": "^5.3.0",
     "@hookform/resolvers": "^3.10.0",
-    "@mdi/font": "~7.4.47",
     "@tailwindcss/vite": "~4.3.3",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
     "i18next": "~26.4.2",
     "i18next-http-backend": "~3.0.6",
+    "lucide-react": "^1.48.0",
+    "radix-ui": "^1.6.7",
     "react": "^19.3.0",
     "react-dom": "^19.3.0",
     "react-hook-form": "^7.88.0",
     "react-i18next": "~17.0.15",
     "react-router-dom": "~7.18.4",
+    "sonner": "^2.0.8",
+    "tailwind-merge": "^3.7.0",
     "zod": "^3.25.76"
   },
   "devDependencies": {
@@ -27,6 +33,7 @@
     "autoprefixer": "~10.6.1",
     "postcss": "~8.5.28",
     "tailwindcss": "~4.3.3",
+    "tw-animate-css": "^1.4.0",
     "vite": "^8.3.0",
     "vitest": "^5.0.1"
   }