No tray menu after installing `libappindicator` (as prompted) on F42

Hello, I started getting a dialog box a few days ago saying that nautilus-dropbox will start requiring the use of `libappindicator` going forward, and while I had a (technically) functional setup on all my Fedora machines (see #150 ), I installed `libappindicator` and now get no tray menu at all.

Should I have had installed it after the cutoff date shown in the dialog box? Thank you.

No files or tests are named. Reproduce the issue on Fedora 42 with libappindicator installed, then read the context in issue #150 and inspect the installation prompt and tray-menu behavior. Done means the expected installation timing and cause of the missing tray menu are established, with the supported setup documented or fixed.

Written by the indexing model from the issue text.