Reordering widgets in Control Pane

**Describe the bug**
In the Editor Control Pane, I can't reorder custom widgets.

**To Reproduce**
1. Create two instances of a widget, such as Code Block, on a given page
2. Try to change the order of these widgets
- ❌ Highlight the bottom widget's box (so it gets highlighted), then try to cut (cmd + x) it (it does get removed!) and then paste (cmd + v) it above the other one (it does NOT paste)
- ❌ Click and drag the lower widget's box to be above the upper widget's box
- ✅ Switch to the markdown editor to cut/paste the content around (this works!)

When I cut the widget out and paste it into a text editor (VSCode), it pastes several blank lines (no content).

**Expected behavior**
1. Expected to be able to paste the widget, after cutting it out
2. Expected to be able to drag and drop the widget to a new location.

**Screenshots**

**Applicable Versions:**
- decap-cms-app 3.8.4
- decap-cms-core 3.9.0
- decap-cms 3.8.4
- GitHub (local mode for development)
- MacOS 15.6.1
- Firefox 14.4.0

**CMS configuration**

config.yml
```
# When using the default proxy server port. Run `npm run decap-proxy` to start.
local_backend: true
backend:
name: git-gateway

publish_mode: editorial_workflow
media_folder: "/assets/images/uploads/"
collections:
- label: Page
name: pages
folder: content
create: true
slug: "{{slug}}"
path: "{{slug}}/index"
editor:
preview: true
fields:
- {
label: "Layout",
name: "layout",
widget: "hidden",
default: "layouts/base.webc",
}
- {
label: "Permalink",
name: "permalink",
widget: "string",
default: "{{slug}}/",
}
- { label: "Title", name: "title", widget: "string" }
- { label: "Lead text", name: "lead", widget: "text", required: false }
- {
label: "Lead image",
name: "image",
widget: "image",
media_folder: "/assets/images/uploads/",
required: false,
}
- {
label: "Description",
name: "description",
widget: "text",
required: false,
}
- { label: "Body", name: "body", widget: "markdown" }
- label: "Site admin"
name: "site"
editor:
preview: false
files:
- label: "Global text"
name: "global"
file: "_data/site.json"
fields:
- { label: Site title, name: title, widget: string }
- { label: Agency, name: agency, widget: string }
- { label: Program name, name: name, widget: string }
- label: "Site alert"
name: "site_alert"
widget: "object"
collapsed: true
fields:
- {
label: "Show Site Alert?",
name: show_site_alert,
widget: boolean,
}
- { label: Title, name: title, widget: string }
- { label: Message, name: message, widget: markdown }
```

**Additional context**