chore: Add Next.js 16 support to examples and blocks package (#2451)

* chore: Add Next.js 16 support to examples and blocks package

Bumps next to ^16 in tutorial, custom-toolbar, and block-support examples, switches sassOptions.includePaths to loadPaths so WordPress block-style SCSS imports resolve under Next 16, and widens the @faustwp/blocks next peer dependency to allow 16.

* fix: align block-support node engine with Next 16

* fix(tutorial-example): use sass loadPaths in Next config

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

Author: josephfusco

.changeset/blocks-nextjs-16-peer.md

@@ -0,0 +1,5 @@
+---
+"@faustwp/blocks": patch
+---
+
+Widen the `next` peer dependency to allow Next.js 16.

examples/next/block-support/next.config.js

@@ -7,7 +7,7 @@ const { createSecureHeaders } = require('next-secure-headers');
 module.exports = withFaust({
   reactStrictMode: true,
   sassOptions: {
-    includePaths: ['node_modules'],
+    loadPaths: ['node_modules'],
   },
   images: {
     domains: [getWpHostname()],