Replace Firebase Storage with MinIO and add user account features

- Storage Integration:
  * Remove Firebase Storage dependency and useFirebaseStorage composable
  * Implement direct MinIO uploads via POST /storage/upload with multipart/form-data
  * Upload canvas JSON, preview PNG, and production PNG as separate objects
  * Store public URLs and metadata in design records

- Authentication & Registration:
  * Add email/password registration page with validation
  * Integrate backend user session via /auth/login endpoint
  * Store backendUser.id as ownerId in design records
  * Auto-sync backend session on Firebase auth state changes

- User Account Pages:
  * Create profile page showing user details and backend session info
  * Create orders page with transaction history filtered by customerEmail
  * Add server proxy /api/orders to forward GET /transactions queries

- Navigation Improvements:
  * Replace inline auth buttons with avatar dropdown menu
  * Add Profile, Orders, and Logout options to dropdown
  * Implement outside-click and route-change handlers for dropdown
  * Display user initials in avatar badge

- API Updates:
  * Update transactions endpoint to accept amount as string
  * Format amount with .toFixed(2) in checkout success flow
  * Query orders by customerEmail instead of ownerId for consistency

app/components/designer/TemplatePicker.vue

@@ -21,7 +21,7 @@ const handleSelect = (templateId: string) => {
     <p class="mt-1 text-sm text-slate-400">
       Pick the vinyl size and print spec that matches this order.
     </p>
-    <div class="mt-4 grid gap-3 md:grid-cols-2">
+    <div class="mt-4 grid gap-3 md:grid-cols-1">
       <button
         v-for="template in props.templates"
         :key="template.id"
@@ -44,7 +44,7 @@ const handleSelect = (templateId: string) => {
             Active
           </span>
         </div>
-        <dl class="mt-3 grid grid-cols-2 gap-x-3 gap-y-2 text-xs text-slate-300">
+        <dl class="mt-3 grid grid-cols-4 gap-x-3 gap-y-2 text-xs text-slate-300">
           <div>
             <dt class="text-slate-500">Diameter</dt>
             <dd>{{ template.diameterInches }}&quot;</dd>