Show in Finder

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## Feature request

**Which Nextcloud Version are you currently using:** (see administration page)
34

**Is your feature request related to a problem? Please describe.**
yes , i would like to open the synced files in a certain app.. for example an image in Photoshop

**Describe the solution you'd like**
i would like to rightclick the in list of synced files and choose show in finder
from there i could easily open the image in Photoshop.

**Describe alternatives you've considered**
none.. going manually thru the folders is possible but unnecessary

**Additional context**
Add any other context or screenshots about the feature request here.

Start by locating the synced-files list and its context-menu implementation, then check how platform-specific folder opening is handled for macOS. Done means a right-click action opens the selected file's containing folder in Finder; verify the behavior with a synced file and the existing desktop test workflow if available.

Written by the indexing model from the issue text.