merge: resolve origin/production into main (#666)

Reconcile production (#664 hackathon track-based prizes + UI updates) with
main. main already contains #664's substance (track-based prizes landed via
the prize overhaul) plus the AI drafting, shared funding modal, treasury, and
bounty reset-to-draft work, so the merge is a content no-op against main.

Conflicts resolved by keeping main's versions (the AI/funding/treasury files
that supersede production's pre-#665 base); removed the duplicate funding
modals production carried under hackathons/new/ (canonical copies live in
organization/funding/); kept main's generated schema.d.ts.

Verified: tsc --noEmit and eslint both pass.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: 0xdevcollins