fix(widget): restore strength drag on lora entries and header

widget.value is a getter/setter that returns a new array on every read,
so handleStrengthDrag with updateWidget=false mutated a discarded copy.
Introduce __dragActive flag to suppress renderLoras in setValue during
drag, allowing mutations to persist through widget.value without
destroying the DOM. Use try-finally to guarantee flag cleanup.

web/comfyui/loras_widget.js

@@ -751,7 +751,11 @@ export function addLorasWidget(node, name, opts, callback) {
         }
       }
 
-      renderLoras(widgetValue, widget);
+      // Skip DOM re-render during drag to preserve pointer capture and event listeners.
+      // The strength inputs are updated directly via the pointermove handler instead.
+      if (!widget.__dragActive) {
+        renderLoras(widgetValue, widget);
+      }
     },
     hideOnZoom: true,
     selectOn: ['click', 'focus']