Favorites of a single received file can't be shown or changed in the preview #4390

Initial Checklist

• I understand this is a bug report and questions should be posted in the Community Discussions
• I searched issues and couldn’t find anything (or linked relevant results below)

Bug Description

In 7.2.4 the recipient of a single shared file can add it to favorites from the preview; on main the preview opened from Shared with me offers no favorite action.

Base's favorite works on the server (oc:favorite=1, listed in Favorites). Main still offers it from search results. Files inside a received shared folder are not affected.

Regression compared with OpenCloud 7.2.4 (web 7.1.5), found in the regression test before the release. Introduced by PR #3177 / d2f756b.

Cause: packages/web-app-files/src/composables/actions/files/useFileActionsFavorite.ts:103-105 hides the action when there is no current folder and a resource is a share resource; it replaced 7.1.5's route check that only applied to the share list views.

Possible fix: Limit the check to the share list views so the preview of a received file keeps the action.

Reproduction Steps

1. margaret shares a single file with lynn (Viewer).
2. Log in as lynn, open Shares > Shared with me and click the file.
3. Look for the star in the preview toolbar and for Add to favorites in the top-bar menu.

Expected Outcome

Star and Add to favorites are there and work.

Actual Outcome

Neither is shown.