Replace form with div to avoid default button handling

main/index.html

@@ -140,7 +140,7 @@
         </div>
 
         <div class="card">
-            <form id="configForm" class="controls">
+            <div class="controls">
                 <div>
                     <label>Sample Rate (Hz)</label>
                     <input type="number" id="sampleRate" value="10000" min="1" max="83333">
@@ -171,9 +171,9 @@
                 </div>
                 <div>
                     <button id="resetBtn">Reset</button>
-                    <button id="powerOff"><a style="text-decoration: none; color: inherit" href="/poweroff">Power off</a></button>
+                    <button id="powerOff">Power off</button>
+                </div>
             </div>
-            </form>
         </div>
 
         <div id="deltaPanel"></div>

main/index.js

@@ -150,8 +150,6 @@ canvas.addEventListener('click', (event) => {
       voltage,
       time: timeOffset
     };
-
-    // draw(); // Removed: Animation loop handles this
   }
 });
 
@@ -411,8 +409,7 @@ function setParams() {
     method: 'POST',
     headers: { 'Content-Type': 'application/json' },
     body: JSON.stringify(payload)
-  })
-    .then(res => {
+  }).then(res => {
     if (res.ok) {
       resetLowRateState();
 
@@ -424,8 +421,7 @@ function setParams() {
     } else {
       alert('Error updating configuration');
     }
-    })
-    .catch(err => alert('Network error: ' + err));
+  }).catch(err => alert('Network error: ' + err));
 };
 
 // Load config from localStorage on startup
@@ -452,6 +448,6 @@ document.getElementById('resetBtn').addEventListener('click', () => {
   localStorage.clear();
   window.location.reload();
 });
+document.getElementById('powerOff').addEventListener('click', () => window.location.href = "/poweroff");
 setParams();
 connect();
-