Fix DST bug

I prompted Claude 3.7 Sonnet thinking with this file and:

> Check the DST display logic

It suggested this fix.

Author: simonw

california-clock-change.html

@@ -245,7 +245,7 @@ <h1>California Clock Change</h1>
 
             // Determine if it is currently daylight savings time or not
             const currentDstDiv = document.getElementById('current-dst');
-            const isDst = pastChange.isSpringForward && futureChange.isSpringForward;
+            const isDst = pastChange.isSpringForward && !futureChange.isSpringForward;
             currentDstDiv.className = 'info-box';
             currentDstDiv.innerHTML = `
                 <div>Current status:</div>