Refactor: clients → companies schema v2

src/lib/email.js

@@ -0,0 +1,8 @@
+import { supabase } from './supabase';
+
+export async function sendEmail(type, to, data) {
+  const { error } = await supabase.functions.invoke('send-email', {
+    body: { type, to, data },
+  });
+  if (error) console.error('Email error:', error);
+}