fix: syntax error — move stray closing div into string

feat: add guide + about panels, Unforgiven II lyrics, Petofi quote, QUANTDOOM edition

fix: remove f-string conflict with JS braces — game now works

fix: mobile-responsive layout + proper Box-Muller matrix generation + HP bar + touch-friendly buttons

QUANTDIABLO — pokoljárás a mátrixon át. 16 szint, Diablo fight.