[bug]: Every drag makes the window freeze until refresh since the last update

### Is there an existing issue for this problem?

- [x] I have searched the existing issues

### Install method

Manual

### Operating system

Linux

### GPU vendor

Nvidia (CUDA)

### GPU model

4090

### GPU VRAM

_No response_

### Version number

v6.14.1

### Browser

Brave

### System Information

I'm using Invoke through Vast.AI using the recommended community preset. I've been doing it for 6+ months now

### What happened

Every time I drag an image or a raster layer, the page freezes until I refresh it

### What you expected to happen

The window to not freeze

### How to reproduce the problem

_No response_

### Additional context

_No response_

### Discord username

_No response_

Start by reproducing the freeze on Linux with Brave using Invoke v6.14.1, dragging an image or raster layer as described. The issue does not name a file, test, or reproduction steps, so first identify the frontend drag-handling entry point and capture what blocks the window. Done means dragging no longer freezes the page and the behavior is covered by a regression test.

Written by the indexing model from the issue text.