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.

vite.config.js

@@ -1,3 +1,4 @@
+import path from 'node:path';
 import { defineConfig } from 'vite';
 import react from '@vitejs/plugin-react';
 import tailwindcss from '@tailwindcss/vite';
@@ -7,4 +8,9 @@ export default defineConfig({
         react(),
         tailwindcss(),
     ],
-});
+    resolve: {
+        alias: {
+            '@': path.resolve(import.meta.dirname, './src'),
+        },
+    },
+});