fix: move/copy to share subfolder fails with PROPFIND 404 (regression from v4→v7)

[IronWERTY]

Description

Moving or copying a file to a subfolder within a received share fails with two PROPFIND 404 errors:

PROPFIND https:///dav/spaces/k2 → 404
PROPFIND https:///dav/spaces/f1/k2 → 404

Moving to the share root works correctly. Moving to subfolders is broken.

Root Cause

In useGetMatchingSpace.ts, getMatchingSpace() uses resource.storageId to find
the matching space. For a subfolder inside a share, storageId is derived as
storageID$spaceID (by splitting fileId on !). However, the share space has
id = storageID$spaceID!rootNodeID — so the lookup never matches.

The fallback then creates a broken share space with id = undefined
(because resource.remoteItemId is not set for subfolders), resulting in
webDavPath = '/spaces' and destination URL /dav/spaces/<folderName>.

Fix

This was already fixed in owncloud/web:

• PR: [full-ci] feat: [OCISDEV-602] use spaceId owncloud/web#13577
• Commit: owncloud/web@c1c28e6
• [OCISDEV-602] use spaceId instead of storageId in getMatchingSpace

The fix changes one line in packages/web-pkg/src/composables/spaces/useGetMatchingSpace.ts:

- let storageId = resource.storageId
+ let storageId = resource.spaceId
(plus adds SpaceId DAV property and populates resource.spaceId in buildResource)

Steps to Reproduce

1. User A shares folder f1 (which contains subfolder k2) with User B
2. User B opens the share, selects a file inside f1/k2/j1/
3. User B tries to move the file to k2 → fails with PROPFIND 404

Version

OpenCloud 7.2.4 (regression introduced in v4→v7 upgrade, worked in v4.0.6)