fix: The server path is not appended to stylesheets before load in Backoffice

[iOvergaard]

Changes

Fixes #19188

• Updates the @tiptap dependencies in the package-lock.json file to a newer version (from 2.11.5 to 2.11.7).
• Prepends the /css path to stylesheets before loading them in the Backoffice in Tiptap

[Copilot]

Pull Request Overview

This PR fixes an issue where the server path is not prepended to stylesheets before being loaded in the Backoffice.

• Updates @tiptap dependencies
• Prepends the "/css" path to stylesheet URLs in the Backoffice

Files not reviewed (2)

• src/Umbraco.Web.UI.Client/package-lock.json: Language not supported
• src/Umbraco.Web.UI.Client/package.json: Language not supported

Comments suppressed due to low confidence (1)

src/Umbraco.Web.UI.Client/src/packages/tiptap/components/input-tiptap/input-tiptap.element.ts:193

• Consider verifying that the stylesheet paths in '#stylesheets' never already include the '/css' prefix to avoid accidentally double prefixing, which could break stylesheet loading.

html`<link rel="stylesheet" href="${STYLESHEET_ROOT_PATH}${stylesheet}" />`,

[Copilot]

Pull Request Overview

This PR addresses issue #19188 by ensuring that stylesheet paths are correctly prefixed with "/css" before being loaded in the Backoffice. The key changes include:

• Updating the @tiptap dependencies from 2.11.5 to 2.11.7 in package-lock.json.
• Introducing a constant for the stylesheet root path.
• Modifying the rendering of stylesheet links to conditionally prepend "/css" to relative paths.

Files not reviewed (2)

• src/Umbraco.Web.UI.Client/package-lock.json: Language not supported
• src/Umbraco.Web.UI.Client/package.json: Language not supported

[AndyButland]

I've tested before and after this PR is applied and verified that the issue is resolved by this update.

However I'm seeing now a failed request for rte-content.css that I don't see when I have release/15.4 checked out and built.

With this PR applied we are getting the /css/ prepended on this path (defined on line 36), ending up with /css/umbraco/backoffice/css/rte-content.css.

Perhaps you need to amend the paths coming back from the server at the point they are received and added to this.#stylesheets?

[iOvergaard]

Absolutely, great catch, @AndyButland. I have moved the logic up so it only applies to the picked stylesheets and not "everything else".

[AndyButland]

Great - all working as expected now.