feat(events): per-track event logistics, per-track roles, and the rebuilt assignments board

[ethnjs]

Summary

1. Event location and staffing are per track: each event records its building, floor, rooms and per-role staffing needs separately for every track (day) it runs on.
2. Tournaments get a buildings catalog and zones (backend only; the buildings page is split out to feat/buildings-and-zones).
3. Roles are held per track: a member can hold a role tournament-wide or only on specific tracks, and staffing assignments sit on the same table.
4. The assignments board is rebuilt around per-track tabs and per-track event sections with staffing progress.
5. The events table gains per-track columns, chained sorting shared with the board, and click-a-row to open the panel.

What changed

Backend

Models and migrations

alembic upgrade head required — 3 revisions plus 2 empty merges.

• New tournament_buildings and tournament_building_tracks; each building is tagged with the tracks it is used on. (6a3b32e96e8c)
• tournament_event_tracks gains building_id, floor and rooms; existing free-text building names are backfilled into the catalog and copied onto every track of the event.
• Destroys data: tournament_events.volunteers_needed is dropped, not migrated, because it names no role. TDs re-enter staffing as per-role needs. The downgrade cannot restore it.
• tournament_events.building, room and floor are dropped after the backfill above.
• New tournament_event_staffing_needs (per event, track and role) and tournament_zones, tournament_zone_members.
• New tournament_track_assignments replaces tournament_membership_roles, tournament_event_assignments and tournament_zone_assignments. (9beadc61ad5a)
• The migration moves every existing role and assignment across, verifies with RAISE EXCEPTION that no member lost a role or permission, and only then drops the three old tables.
• It first repairs events that hold a shift or staffing on a track they aren't linked to, which the new composite FKs would otherwise reject.
• Shift labels must be unique per track; existing duplicates are renamed Label (2), (3)… oldest first. (5b5c2f46ad06)
• 5aac03cebf88 and 90c29492df5b are empty merges with main's heads. They exist so preview databases already at 5aac upgrade without manual stamping.

Schemas and routes

• New /tournaments/{id}/buildings/ (list, create, patch, delete) and /tournaments/{id}/zones/ (coverage list, create, patch, delete).
• Event create/update take track_details (per-track building_id, floor, rooms, needs) instead of building, room, floor, volunteers_needed and track_ids.
• Event reads return track_details with building_name and each need's role_label.
• Roster roles become MemberRoleRead, adding is_tournament_wide and track_ids.
• Building schema requires every building to be on at least one track.

Logic

• Roles and permissions are derived from track assignments; every route that read the old tables is repointed.
• Zones store rules (building, floor or event) and resolve to events; partial unique indexes keep at most one zone per track claiming the same thing.
• Simple vs advanced mode is derived from track count.

Seeding

• seed_members creates the accounts it needs (--create N, a target count) instead of requiring them first.
• Breaking CLI: --seed is renamed --rng-seed.

Frontend

Events

• Per-track time, location and staffing columns, chosen per track as chips.
• Inline editing for name, division, type, tracks, shifts, building/rooms and staffing needs, with keyboard navigation between cells.
• Sorting by a chain of keys, shared with the assignments board.
• Clicking a row opens the event panel; the edit/expand buttons are gone.
• The event panel and mass editor edit location and staffing per track; buildings can be created inline from the picker.

Assignments board

• Per-track tabs, each with its own default filters.
• Event rows broken out by track with staffing progress and editable default roles.
• Drag fixes: per-track bar identity, cursor-pinned drag chip, scrolling whatever is under the cursor.
• An event's panel opens from its name, stacked over the member panel.
• Split into components under components/tournament/assignments/.

Members and roles

• Role chips show where a role is held and set its scope through a pill menu.
• Mass role changes are staged as badges with the scope pill.

Shared UI

• Breaking for imports: Toggle is renamed Switch.
• New CheckboxRow owns checklist row geometry; CheckboxList is compact by default and passes badge through.
• FilterModal backs the member filter; Filter becomes a split button with clear-filters.
• Tables scroll sideways when columns don't fit; tab strips scroll to keep the active tab visible.
• Page headers fold into the topbar on events and assignments.

Not in this PR

• The buildings and zones page: feat/buildings-and-zones.
• Event, shifts, member table upgrades.

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