Each assignment row in the timeline now gets an inline edit (pencil)
that opens a modal with `assigned_at`, `assigned_until`, and notes.
Save calls the existing `PATCH /api/projects/{pid}/assignments/{aid}`;
delete (for misclicks) calls the existing `DELETE`. Open-ended
checkbox clears `assigned_until` and the endpoint flips status back
to "active".
Adds an "+ Add deployment record" button at the top of the timeline
for backfilling historical windows when orphan events sit outside any
assignment. Modal: project → location → assigned_at → assigned_until
(optional open-ended) → notes.
Backend: the `/locations/{loc}/assign` endpoint now accepts an
`assigned_at` form field and a closed-window assignment. The previous
blanket "location already has an active assignment" check is replaced
with same-location overlap detection — closed historical windows that
don't overlap an existing assignment are accepted (which is exactly
the backfill case).
After any save/delete the timeline reloads and the SFM-events list
re-fetches so previously-orphaned events flip to "attributed" when
their timestamp now falls inside an assignment window.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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