[FEATURE] Desktop: show routine runs under their project folder and keep completed one-time routines on the Routines page

Desktop app (Code tab), macOS.

Problem

Runs of a scheduled routine only appear under the routine itself. They never show in the sidebar under the project folder (cwd) the routine ran in, and they can't be moved there or into a custom group. Trying to move one returns: "Routine runs show under their routine, not as their own sidebar rows, so they can't be grouped, pinned or marked."

On top of that, once a one-time routine has run, it disappears from the Routines page and from the Routines section in the sidebar, even with every filter (Runs on / Schedule / Status) set to "All". The only way I found to reach its runs is Search → Scheduled, where it is listed as "Completed".

Expected

• Show routine runs (also) in the sidebar under the project folder they ran in, or let the user move them there.
• Keep completed one-time routines visible on the Routines page, e.g. with a "Completed" status filter.

Use case

I schedule one-time follow-up checks per client project (e.g. "check conversion tracking 7 days after a change"). The run's result belongs with that project's other sessions. Today it is hidden: the routine vanishes from the Routines page after it runs, and the run never appears under the project, so I only find it if I remember to look in Search → Scheduled.

Related: #100563 (run-history side panel for scheduled tasks).