fix(cycler): prevent node drag when interacting with index input in Vue DOM mode

Add @pointerdown.stop, @pointermove.stop, @pointerup.stop modifiers to the
index input element to stop pointer event propagation to parent node.
This prevents unintended node dragging when user clicks/drags on the index
input for value adjustment or text selection.

Follows the pattern used by ComfyUI built-in widgets like
WidgetLayoutField and WidgetTextarea.

vue-widgets/src/components/lora-cycler/LoraCyclerSettingsView.vue

@@ -52,6 +52,9 @@
           :disabled="totalCount === 0"
           @input="onIndexInput"
           @blur="onIndexBlur"
+          @pointerdown.stop
+          @pointermove.stop
+          @pointerup.stop
         />
         <span class="index-hint">1 - {{ totalCount || 1 }}</span>
       </div>