feat: [WD-34756] Proceed with Custom Storage Volume upon creation

[Kxiru]

Done

• When creating a custom storage volume when attaching a disk device, the UI now proceeds with the newly created volume rather than navigating back to the storage volume selection page.
• Amended affected tests.

QA

1. Run the LXD-UI:
   • On the demo server via the link posted by @webteam-app below. This is only available for PRs created by collaborators of the repo. Ask @Kxiru or @edlerd for access.
   • With a local copy of this branch, build and run as described in the docs.
2. Perform the following QA steps:
   • Navigate to any instance
   • Go to configuration > disk
   • Add a new disk device
   • Attach a custom storage volume
   • Create a new volume
   • Minimum: Add a name for the volume and use the default driver.
   • Create the volume and observe that the volume is automatically added as a disk device to the instance.

Screenshots

Screencast.from.2026-04-28.16-08-56.webm

[webteam-app]

Demo

Jenkins

demos.haus