Howdy Week deferred points award

[akhilk999]

Summary

Howdy Week events track prospective attendance in event_guests. Linked guests already get attendance rows at 0 points (CSV upload / rematch / register auto-link). Officers should later be able to award points for those existing attendance rows without re-running a mixer-style org filter.

Desired behavior

• On a published Howdy Week event detail page, add an Award points control (officer/admin only).
• Officer chooses award type: General Meeting (2) / CSA-Wide (3) / CSA-Wide Mixers (3) (display/bucket semantics only — do not require mixer "org contains CSA" filter or JT-family rules).
• Apply points to existing attendance rows for linked members (e.g. update event point_value / award metadata, or set overrides) — do not invent attendance from scratch.
• Unmatched guests stay on event_guests for outreach; they do not get points until linked.
• Idempotent: awarding twice must not duplicate attendance.
• After a successful award, the button is disabled / not clickable (persist award state on the event, e.g. points_awarded_at / points_awarded_as columns).
• Prefer an explicit award action over morphing the event category (category change would also flip check-in type and labels).

Already implemented

Guest CSV, auto-link on register, rematch (event detail + Guests tab), badges, Guests outreach tab with export log, and 0-pt attendance for linked members.

Test plan

• Award with linked attendance → points appear on leaderboard/profile
• Award with unmatched guests only → no points / clear message
• Re-click award → blocked / no-op, UI disabled
• Leaderboard buckets match chosen award type
• Caps (JT weekly / spectator) do not apply unless we intentionally map into those categories later (current intent: GM / CSA-Wide / Mixers bucket only)