Abdul Rahman
db5338cf32
## Group records by relation (Kanban + Table)
Adds grouping by `MANY_TO_ONE` relation fields on both board and table
views, reusing the existing `ViewGroup` storage (`fieldValue = related
record id`).
- **New group** record picker to create relation-backed groups (board
column + table row)
- Relation-aware group headers (name/avatar), filtering, and drag-drop
(writes the FK join column) — all using one canonical `${name}Id` column
- Sort menu hides alphabetical options when grouping by a relation (no
comparable title)
- A group whose backing record no longer exists renders a "Deleted" chip
instead of a blank header
- **Backend:** allow `MANY_TO_ONE` relations as the Kanban
`mainGroupByField` in the flat-view validator
https://github.com/user-attachments/assets/267077a6-2667-4506-b178-eee420a16f20
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