feat: add prestige system and skill upgrades with comprehensive documentation

src/lib/game/hooks/useGameDerived.ts

@@ -17,7 +17,7 @@ import {
   getElementalBonus,
 } from '../store/computed';
 import { ELEMENTS, GUARDIANS, SPELLS_DEF, getStudySpeedMultiplier, getStudyCostMultiplier, HOURS_PER_TICK, TICK_MS } from '../constants';
-import { hasSpecial, SPECIAL_EFFECTS } from '../upgrade-effects';
+import { hasSpecial, SPECIAL_EFFECTS } from '../special-effects';
 
 /**
  * Hook for all mana-related derived stats