First set of upgrades for the Panel component

src/myfasthtml/assets/myfasthtml.js

@@ -72,6 +72,8 @@ function initResizer(containerId, options = {}) {
     // Add resizing class for visual feedback
     document.body.classList.add('mf-resizing');
     currentItem.classList.add('mf-item-resizing');
+    // Disable transition during manual resize
+    currentItem.classList.add('no-transition');
   }
 
   /**
@@ -114,6 +116,8 @@ function initResizer(containerId, options = {}) {
     // Remove resizing classes
     document.body.classList.remove('mf-resizing');
     currentItem.classList.remove('mf-item-resizing');
+    // Re-enable transition after manual resize
+    currentItem.classList.remove('no-transition');
 
     // Get final width
     const finalWidth = currentItem.offsetWidth;