Add logo click to return to customers view

Clicking the CuituNet Intra brand/logo in the header
navigates back to the Asiakkaat (customers) tab.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

script.js

@@ -191,6 +191,15 @@ document.querySelectorAll('.tab').forEach(tab => {
     });
 });
 
+// Logo -> Asiakkaat (alkunäkymä)
+document.getElementById('brand-home').addEventListener('click', () => {
+    document.querySelectorAll('.tab').forEach(t => t.classList.remove('active'));
+    document.querySelectorAll('.tab-content').forEach(c => c.classList.remove('active'));
+    document.querySelector('.tab[data-tab="customers"]').classList.add('active');
+    document.getElementById('tab-content-customers').classList.add('active');
+    loadCustomers();
+});
+
 // Käyttäjät-nappi headerissa
 document.getElementById('btn-users').addEventListener('click', () => {
     document.querySelectorAll('.tab').forEach(t => t.classList.remove('active'));