Panels introduced by extensions break when resetting layout to default

[anti-matt-er]

Pixelorama version:
1.1.10-stable

Where did you download Pixelorama from?
GitHub Releases

OS/device including version:
macOS Tahoe 26.4.1

Issue description:
If an extension adds a panel using ExtensionsApi.panel.add_node_as_tab, it will become orphaned from the dockable container and "float" above where it was previously docked.

It's fixed on the next restart and returns to the default location besides the Tools panel.

See screenshot below - the blank area on the left is the orphaned panel, obstructing the tools panel and part of the canvas:

Steps to reproduce:

1. Load an extension that introduces a panel
2. Note the panel docked in the default location besides the Tools panel (you can move it elsewhere and the issue will still trigger)
3. Click Window > Layouts > Reset Default
4. Panel becomes orphaned

I've also attached an example MRP extension which simply implements the official "Add new Tab" example from the extension docs

PanelBugMRP.zip