feat: complete Week 1 frontend setup (#9 #10 #11 #12)

- Install and configure Tailwind CSS (#9)
- Install Nuxt UI component library (#10)
- Create app layout with header/footer components (#11)
- Implement Supabase client composable (#12)
- Add TypeScript database types
- Create placeholder pages (index, scan, settings)
- Setup responsive navigation with mobile menu
- Configure auth state management

All Week 1 frontend foundation tasks complete.

app/package.json

@@ -10,8 +10,14 @@
     "postinstall": "nuxt prepare"
   },
   "dependencies": {
+    "@nuxt/fonts": "^0.13.0",
+    "@nuxt/ui": "^4.4.0",
+    "@supabase/supabase-js": "^2.95.3",
     "nuxt": "^4.3.1",
     "vue": "^3.5.28",
     "vue-router": "^4.6.4"
+  },
+  "devDependencies": {
+    "@nuxtjs/tailwindcss": "^6.14.0"
   }
 }