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pad/internal/models
xarmian 367116b3a0 Unify relation fields and item links into single dependency system (#66)
* feat: unify relation fields and item links into single dependency system

Phase membership (Task→Phase) was previously stored as a UUID in the
item's fields JSON, separate from the item_links table used for
blocks/related/implements relationships. This unifies both into the
item_links table so all item relationships use one system.

Backend:
- Add 'phase' link type to item_links constants
- Migration 021: migrate existing phase field values to item_links,
  strip phase from fields JSON, remove phase field from tasks schema
- Rewrite GetPhaseProgress, GetAllPhasesProgress, GetTasksForPhase
  to JOIN on item_links instead of json_extract(fields, '$.phase')
- Add SetPhaseLink, ClearPhaseLink, GetPhaseForItem, GetTaskPhaseMap
  store helpers with single-phase constraint enforcement
- Create/update handlers intercept 'phase' in fields and route through
  links system; enrich item responses with phase_id/ref/title
- Dashboard orphan detection uses batch GetTaskPhaseMap lookup
- Add PhaseID filter to ItemListParams for link-based list filtering

Frontend:
- Remove relation field type from FieldEditor (no longer needed)
- Add link CRUD UI to item detail page: "Add relationship" inline form
  with link type picker + item search, delete buttons on existing links
- Phase links appear in Relationships section as "In phase"/"Phase"
- ItemCard reads phase from item.phase_title instead of fields.phase
- FilterBar phase filter uses item.phase_id for client-side filtering
- Add api.links.delete to frontend API client
- Fix duplicate {#each} key on dashboard attention list

Implements IDEA-106.

* fix: remove relationLabels prop from BoardView, ListView, TableView

ItemCard no longer accepts relationLabels (phase info now comes from
item.phase_title), so remove the prop from all parent view components
that were passing it through. Also remove unused .cell-relation CSS.

* fix: address PR review — atomic SetPhaseLink, migration safety, error handling

1. Migration 021: remove deleted_at filters so archived tasks and tasks
   pointing to archived phases also get their phase links migrated.

2. SetPhaseLink: wrap delete+insert in a transaction so a failed insert
   doesn't leave the item with no phase link (previously non-atomic).

3. Create/update handlers: return proper HTTP errors when phase link
   operations fail instead of logging warnings and returning 200 OK.
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