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>

index.html

@@ -54,7 +54,7 @@
     <div id="dashboard" style="display:none">
         <header>
             <div class="header-left">
-                <div class="header-brand">
+                <div class="header-brand" id="brand-home" style="cursor:pointer;">
                     <span class="brand-icon">&#9889;</span>
                     <div>
                         <h1>CuituNet Intra</h1>

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'));