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/pages/settings.vue

@@ -0,0 +1,74 @@
+<template>
+  <div>
+    <h1 class="text-3xl font-bold text-gray-900 mb-6">Settings</h1>
+    
+    <div class="grid gap-6 md:grid-cols-2">
+      <UCard>
+        <template #header>
+          <h3 class="text-lg font-semibold">Account</h3>
+        </template>
+        
+        <div class="space-y-4">
+          <div v-if="user">
+            <label class="text-sm font-medium text-gray-700">Email</label>
+            <p class="text-gray-900">{{ user.email }}</p>
+          </div>
+          
+          <UButton 
+            v-if="!user"
+            to="/auth/login"
+            color="primary"
+          >
+            Sign In
+          </UButton>
+        </div>
+      </UCard>
+
+      <UCard>
+        <template #header>
+          <h3 class="text-lg font-semibold">Tags</h3>
+        </template>
+        
+        <p class="text-gray-600">
+          Manage your custom tags here (coming in Week 2).
+        </p>
+      </UCard>
+
+      <UCard>
+        <template #header>
+          <h3 class="text-lg font-semibold">Units</h3>
+        </template>
+        
+        <p class="text-gray-600">
+          Manage your custom units here (coming in Week 2).
+        </p>
+      </UCard>
+
+      <UCard>
+        <template #header>
+          <h3 class="text-lg font-semibold">About</h3>
+        </template>
+        
+        <div class="space-y-2 text-sm text-gray-600">
+          <p><strong>Pantry</strong> v0.1.0-alpha</p>
+          <p>Self-hosted inventory management</p>
+          <a 
+            href="https://github.com/pantry-app/pantry" 
+            target="_blank"
+            class="text-primary hover:underline"
+          >
+            View on GitHub →
+          </a>
+        </div>
+      </UCard>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+const { user } = useSupabaseAuth()
+
+definePageMeta({
+  layout: 'default'
+})
+</script>