Phases 7D-F — fighter sprites, hit/KO reactions, image-first pipeline + 6 AI idle sprites

A run of arena/sprite work across Phases 7D-F, ending with the full 6-fighter idle roster generated via Pollinations/flux.

What changed

Phase 7D (6c9174c) — Introduced humanoid fighter sprites plus hit/KO reactions and a 5s timer. Touched the arena (FighterSprite.tsx, KiAuraArena.tsx), the Countdown component, GameBoard.tsx, the finale (MatchFinale.tsx), and both the landing and PvP pages (page.tsx, pvp/page.tsx).

Phase 7E (fb32b62) — Reworked the fighter sprites toward a shōnen-knockoff style and added auto-advance turns. Scoped to page.tsx and FighterSprite.tsx.

Phase 7F (09973a6) — Added a match-end final-blow KO sequence and shifted to an image-first sprite pipeline. Added docs/firefly-prompts.md, a fighters README (web/public/fighters/README.md), and web/src/lib/assets.ts, alongside changes to FighterSprite.tsx and MatchFinale.tsx.

9f383b2 — Added a pose-specific PNG fallback chain in FighterSprite.tsx and committed the first reference sprite asset, web/public/fighters/haneul/idle.png.

ca85233 — Generated the fighter idle sprites via Pollinations/flux, committing idle.png PNGs for bora, danbi, seokjin, taeyang, and yuri.

Roster note

This commit's subject reads "all 6 fighter idle sprites," but ca85233 itself only changed 5 idle.png files (bora, danbi, seokjin, taeyang, yuri). The 6th — haneul/idle.png — was committed earlier in 9f383b2. So "all 6" refers to the roster reaching completion, not 6 files in this single commit.

Commits

• 6c9174c — feat(web): humanoid fighter sprites, hit/KO reactions, 5s timer (Phase 7D)
• fb32b62 — feat(web): shōnen-knockoff fighter sprites + auto-advance turns (Phase 7E)
• 09973a6 — feat(web): match-end final-blow KO sequence + image-first sprite pipeline (Phase 7F)
• 9f383b2 — feat(web): pose-specific PNG fallback chain + haneul reference sprite
• ca85233 — feat(art): all 6 fighter idle sprites via Pollinations/flux