Nodes 2.0: Numeric widget drag doesn't work

## Bug Report

### Expected Behavior
Dragging on numeric input fields should adjust the value up/down, like in LiteGraph nodes.

### Actual Behavior
When Nodes 2.0 is enabled, dragging on numeric inputs has no effect. The values don't change at all.

### Steps to Reproduce
1. Enable Nodes 2.0 BETA in the UI toggle
2. Open any node with numeric inputs (e.g., KSampler, Load Image)
3. Try to drag on a numeric value (e.g., "788")
4. Value doesn't change

### Works in LiteGraph nodes
Switching back to LiteGraph nodes, the drag works perfectly.

### System Info
- ComfyUI: v0.4.0
- Frontend: Latest version
- OS: Windows
- GPU: RTX 4090

### Additional Info
This is blocking Nodes 2.0 adoption as numeric adjustment is a core workflow feature.

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-7414-Nodes-2-0-Numeric-widget-drag-doesn-t-work-2c76d73d365081209690cc4e517822d3) by [Unito](https://www.unito.io)