Implement WYSIWYG newsletter editor with live preview, import, Supabase auto-save and Brevo export

src/app/api/inline-css/route.ts

@@ -0,0 +1,24 @@
+import { NextRequest, NextResponse } from 'next/server';
+import juice from 'juice';
+
+export async function POST(req: NextRequest) {
+  try {
+    const { html } = await req.json();
+
+    if (!html) {
+      return NextResponse.json({ error: 'HTML obsah je povinný.' }, { status: 400 });
+    }
+
+    const inlined = juice(html, {
+      preserveMediaQueries: true,
+      removeStyleTags: false,
+      applyWidthAttributes: true,
+      applyHeightAttributes: true
+    });
+
+    return NextResponse.json({ html: inlined });
+  } catch (err: any) {
+    console.error('Inlining error:', err);
+    return NextResponse.json({ error: err.message }, { status: 500 });
+  }
+}