feat: Implement study special effects

- MENTAL_CLARITY: +10% study speed when mana > 75%
- STUDY_RUSH: First hour of study is 2x speed
- STUDY_MOMENTUM: +5% study speed per consecutive hour (max +50%)
- KNOWLEDGE_ECHO: 10% chance for instant study progress
- STUDY_REFUND: 25% mana back on study completion
- Add tracking for studyStartedAt and consecutiveStudyHours
- Reset tracking when study completes or stops

src/lib/game/store.ts

@@ -455,17 +455,65 @@ export const useGameStore = create<GameStore>()(
         let spells = state.spells;
         let log = state.log;
         let unlockedEffects = state.unlockedEffects;
-        
+        let consecutiveStudyHours = state.consecutiveStudyHours || 0;
+        let studyStartedAt = state.studyStartedAt;
+
         if (state.currentAction === 'study' && currentStudyTarget) {
-          const studySpeedMult = getStudySpeedMultiplier(skills);
+          // Track when study started (for STUDY_RUSH)
+          if (studyStartedAt === null) {
+            studyStartedAt = newTotalTicks;
+          }
+
+          // Calculate study speed with all bonuses
+          let studySpeedMult = getStudySpeedMultiplier(skills);
+
+          // MENTAL_CLARITY: +10% study speed when mana > 75%
+          if (hasSpecial(effects, SPECIAL_EFFECTS.MENTAL_CLARITY) && state.rawMana >= maxMana * 0.75) {
+            studySpeedMult *= 1.1;
+          }
+
+          // STUDY_RUSH: First hour of study is 2x speed
+          const hoursStudied = (newTotalTicks - studyStartedAt) * HOURS_PER_TICK;
+          if (hasSpecial(effects, SPECIAL_EFFECTS.STUDY_RUSH) && hoursStudied < 1) {
+            studySpeedMult *= 2;
+          }
+
+          // STUDY_MOMENTUM: +5% study speed per consecutive hour (max +50%)
+          if (hasSpecial(effects, SPECIAL_EFFECTS.STUDY_MOMENTUM)) {
+            const momentumBonus = Math.min(0.5, consecutiveStudyHours * 0.05);
+            studySpeedMult *= 1 + momentumBonus;
+          }
+
           const progressGain = HOURS_PER_TICK * studySpeedMult;
+
+          // KNOWLEDGE_ECHO: 10% instant study chance
+          let instantProgress = 0;
+          if (hasSpecial(effects, SPECIAL_EFFECTS.KNOWLEDGE_ECHO) && Math.random() < 0.1) {
+            instantProgress = currentStudyTarget.required - currentStudyTarget.progress;
+            log = [`⚡ Knowledge Echo! Instant study progress!`, ...log.slice(0, 49)];
+          }
+
           currentStudyTarget = {
             ...currentStudyTarget,
-            progress: currentStudyTarget.progress + progressGain,
+            progress: currentStudyTarget.progress + progressGain + instantProgress,
           };
-          
+
+          // Increment consecutive study hours
+          consecutiveStudyHours += HOURS_PER_TICK;
+
           // Check if study is complete
           if (currentStudyTarget.progress >= currentStudyTarget.required) {
+            // STUDY_REFUND: 25% mana back on study complete
+            if (hasSpecial(effects, SPECIAL_EFFECTS.STUDY_REFUND) && state.lastStudyCost > 0) {
+              const refund = Math.floor(state.lastStudyCost * 0.25);
+              rawMana = Math.min(rawMana + refund, maxMana);
+              log = [`💰 Study Refund! Recovered ${refund} mana!`, ...log.slice(0, 49)];
+            }
+
+            // Reset study tracking
+            studyStartedAt = null;
+            consecutiveStudyHours = 0;
+
             if (currentStudyTarget.type === 'skill') {
               const skillId = currentStudyTarget.id;
               const currentLevel = skills[skillId] || 0;
@@ -501,6 +549,9 @@ export const useGameStore = create<GameStore>()(
             }
             currentStudyTarget = null;
           }
+        } else {
+          // Reset consecutive study hours when not studying
+          consecutiveStudyHours = 0;
         }
 
         // Convert action - auto convert mana
@@ -922,6 +973,8 @@ export const useGameStore = create<GameStore>()(
           totalSpellsCast,
           familiars,
           consecutiveHits: state.currentAction === 'climb' ? state.consecutiveHits + hitsThisTick : state.consecutiveHits,
+          consecutiveStudyHours,
+          studyStartedAt,
           ...craftingUpdates,
         });
       },