Dependencies: Updates @umbraco-ui/uui to 1.17.2 to fix multiple folder drag-and-drop failing (closes #21837)

[iOvergaard]

Summary

This fixes two separate issues that together caused only the first folder to appear when dragging multiple folders into the Media section simultaneously.

Fix 1 — UUI 1.17.2 (@umbraco-ui/uui bump):
DataTransferItem.webkitGetAsEntry() returns null after the first await in a drop handler because the browser expires the drag data store. The old _getAllEntries loop in uui-file-dropzone awaited _mkdir() on the first folder before reading subsequent items, so only folder #1 was ever retrieved. Fixed in umbraco/Umbraco.UI#1339 and published as @umbraco-ui/uui@1.17.2.

Fix 2 — await in UmbMediaDropzoneManager:
#handleFile() and #handleFolder() were called without await in both #createMediaItems and #createOneMediaItem. The flat item list has parent folders before their children — without await, children could race ahead of parent creation on the server, causing 404 errors.

Changes

• Bumps @umbraco-ui/uui to ^1.17.2
• Adds await to #handleFile() and #handleFolder() calls in UmbMediaDropzoneManager

Fixes #21837

Test plan

• Drag 2+ folders (each containing files) from the OS file manager into the Media section simultaneously
• Verify all folders and their contents appear correctly in the Media tree
• Verify no 404 errors in the browser console/network tab
• Verify single-file and single-folder drag-and-drop still works as before

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR fixes a race condition that occurs when multiple folders are dragged into the Media section simultaneously. When folders containing files are dropped, the flat item list has parent folders listed before their children. Without await, child items could attempt to be created before their parent folders exist on the server, resulting in 404 errors.

Changes:

• Added await to #handleFile() and #handleFolder() method calls to serialize media item creation
• Updated inline comment to clarify the purpose of awaiting these operations

[leekelleher]

@iOvergaard Tested it out, but it didn't work on my local machine (latest Chrome/Windows). When attempting upload multiple folders, only the last folder I'd selected is uploaded. No 404 errors in the devtool console.

[leekelleher]

Tested out, works as described! 🚀

There's an error with the build, related to circular references (from a different PR), let's see if we can get that fixed in main.