feat(docs): add registration page and update sidebar and account documentation page

apps/docs/.vitepress/sidebar.ts

@@ -242,6 +242,10 @@ export const sidebar = [
             text: "Login",
             link: "/frontends-recipes/account/login.html",
           },
+          {
+            text: "Register",
+            link: "/frontends-recipes/account/register.html",
+          },
           {
             text: "Wishlist",
             link: "/frontends-recipes/account/wishlist.html",

apps/docs/src/frontends-recipes/account/addresses.md

@@ -1,6 +1,6 @@
 ---
 nav:
-  position: 40
+  position: 50
 recipe:
   area: account
   status: stable

apps/docs/src/frontends-recipes/account/index.md

@@ -10,6 +10,8 @@ Recipes for customer session and account flows.
 
 <PageRef page="login.html" title="Login" sub="Understand the customer login flow, Store API operations, generated types, context refresh, cart refresh, and error handling." />
 
+<PageRef page="register.html" title="Register" sub="Understand the customer registration request, its nested billing address, salutation and country lookups, double opt-in confirmation, session context refresh, and constraint violation handling." />
+
 <PageRef page="wishlist.html" title="Wishlist" sub="Understand the customer wishlist as a paginated product search, the Store API wishlist operations, the shared composable state, and what one page of results does not tell you." />
 
 <PageRef page="newsletter.html" title="Newsletter" sub="Understand the double opt-in lifecycle, the newsletter Store API operations, the injected storefrontUrl, the per-instance status state, and what stays unknown for a guest." />

apps/docs/src/frontends-recipes/account/newsletter.md

@@ -1,6 +1,6 @@
 ---
 nav:
-  position: 30
+  position: 40
 recipe:
   area: account
   status: stable