Firefox Wayland: Broken text selection

### Prerequisites

- [x] I am running the latest version of ComfyUI
- [x] I have searched existing issues to make sure this isn't a duplicate
- [x] I have tested with all custom nodes disabled ([see how](https://docs.comfy.org/troubleshooting/custom-node-issues#step-1%3A-test-with-all-custom-nodes-disabled))

### What happened?

When trying to select text from nodes spanning more than one line, the selection jumps to the top rather than following what we want to select. This behavior is observed on latest stable Firefox as of the time of writing, with no extensions, running on KDE Plasma 6 Wayland, regardless of the node used.

### Steps to Reproduce

1. Open ComfyUI from Firefox Wayland
2. Paste a prompt
3. Try to select text that spans more than one line
4. Observed the bug

### How is this affecting you?

Visual/UI issue only

### ComfyUI Frontend Version

1.25.10

### Browser

Firefox

### Console Errors

```javascript

```

### Logs

```shell

```

### Additional Context

_No response_

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-5211-Firefox-Wayland-Broken-text-selection-25b6d73d3650819db91fc84b6cbd914b) by [Unito](https://www.unito.io)