Non-http[s] links in Deck can't be opened

Note was previously logged in nextcloud/deck, but a comment suggested it should be here.

Describe the bug
Links in the description of Deck Cards that do not start http / https cannot be opened.

To Reproduce
Steps to reproduce the behavior:

1. Create a new Card
2. In the Description, add three links:
3. Name: Google; URL: www.google.com/maps
4. Name: Joplin Example; URL: joplin://x-callback-url/openNote?id=abc
5. Name: File Example; URL: file:///C:/Users/user.name/Folder

Expected behavior
Clicking the links in the cards should follow this pattern:

1. Click link -> Opens preview box, showing preview (if available), link, Copy/Edit/Remove actions; clicking the preview or link opens the link per browser configuration.

Observed behavior
Clicking links which do not start (I assume) http[s]:// opens preview box, showing NO preview, link, Copy/Edit/Remove actions; nothing in the box can be clicked to open the link.

Workaround
Clicking the link, clicking the Copy Link button and pasting that URL into a new tab/window works as expected, but is a multi-step process.

Screenshots

Client details:

• OS: Windows 10
• Same behaviour on Firefox 133.0.3 and Edge Version 131.0.2903.112 (Official build) (64-bit)
• Device: Desktop
  Note:
• Appears to function as expected on Deck Mobile app (Android), although the File type link causes a full-on crash of the App. Anyone want me to log that?

Operating system:
Web server:
Database:
PHP version:
Nextcloud version: (see Nextcloud admin page)
Where did you install Nextcloud from:

Docker / official Nextcloud AIO Version: "Nextcloud Hub 9 (30.0.4)"
Deck Version 1.14.2

Login as admin user into your Nextcloud and access
http://example.com/index.php/settings/integrity/failed
paste the results here.

No errors have been found.

No source file or test is named in the issue. Start by reproducing the behavior in a Deck card description with the listed www, joplin, and file URLs, then trace the link preview interaction in the relevant frontend code. Done means the preview or link opens non-http[s] URLs according to the browser configuration without requiring copy and paste.