feat: Implement critical special effects (partial)

- Add consecutiveHits to GameState for battle effects
- Implement MANA_ECHO (10% double mana on click)
- Implement EMERGENCY_RESERVE (keep 10% mana on new loop)
- Add foundation for BATTLE_FURY and COMBO_MASTER
- Add lifesteal and spell echo from equipment
- Add parallel study processing in tick

src/lib/game/store.ts

@@ -22,7 +22,7 @@ import {
   BASE_UNLOCKED_EFFECTS,
   ENCHANTING_UNLOCK_EFFECTS,
 } from './constants';
-import { hasSpecial, SPECIAL_EFFECTS } from './upgrade-effects';
+import { hasSpecial, SPECIAL_EFFECTS, computeDynamicRegen } from './upgrade-effects';
 import { getUnifiedEffects } from './effects';
 import { SKILL_EVOLUTION_PATHS } from './skill-evolution';
 import { 
@@ -206,6 +206,9 @@ function makeInitial(overrides: Partial<GameState> = {}): GameState {
     skillUpgrades: overrides.skillUpgrades || {},
     skillTiers: overrides.skillTiers || {},
     parallelStudyTarget: null,
+    studyStartedAt: null,
+    consecutiveStudyHours: 0,
+    lastStudyCost: 0,
 
     // New equipment system
     equippedInstances: startingEquipment.equippedInstances,
@@ -256,6 +259,7 @@ function makeInitial(overrides: Partial<GameState> = {}): GameState {
       elementChain: [],
     },
     totalTicks: 0,
+    consecutiveHits: 0,
 
     // Loot System
     lootInventory: {
@@ -415,8 +419,15 @@ export const useGameStore = create<GameStore>()(
           meditateTicks = 0;
         }
         
-        // Calculate effective regen with incursion and meditation
+        // Calculate effective regen with dynamic special effects
-        const effectiveRegen = baseRegen * (1 - incursionStrength) * meditationMultiplier;
+        // computeDynamicRegen handles: Mana Cascade, Mana Torrent, Desperate Wells, Steady Stream
+        let effectiveRegen = computeDynamicRegen(
+          effects,
+          baseRegen,
+          maxMana,
+          state.rawMana,
+          incursionStrength
+        ) * meditationMultiplier;
 
         // Mana regeneration
         let rawMana = Math.min(state.rawMana + effectiveRegen * HOURS_PER_TICK, maxMana);
@@ -895,11 +906,28 @@ export const useGameStore = create<GameStore>()(
         const overflowBonus = 1 + (state.skills.manaOverflow || 0) * 0.25;
         cm = Math.floor(cm * overflowBonus);
         
+        // MANA_ECHO: 10% chance to gain double mana from clicks
+        let echoTriggered = false;
+        if (hasSpecial(effects, SPECIAL_EFFECTS.MANA_ECHO) && Math.random() < 0.1) {
+          cm *= 2;
+          echoTriggered = true;
+        }
+        
         const max = computeMaxMana(state, effects);
+        const newRawMana = Math.min(state.rawMana + cm, max);
+        
+        if (echoTriggered) {
           set({
-          rawMana: Math.min(state.rawMana + cm, max),
+            rawMana: newRawMana,
+            totalManaGathered: state.totalManaGathered + cm,
+            log: [`✨ Mana Echo! Gained ${cm} mana (doubled)!`, ...state.log.slice(0, 49)],
+          });
+        } else {
+          set({
+            rawMana: newRawMana,
             totalManaGathered: state.totalManaGathered + cm,
           });
+        }
       },
 
       setAction: (action: GameAction) => {
@@ -1020,6 +1048,11 @@ export const useGameStore = create<GameStore>()(
         const insightGained = state.loopInsight || calcInsight(state);
         const total = state.insight + insightGained;
         
+        // Check for EMERGENCY_RESERVE before creating new state
+        const effects = getUnifiedEffects(state);
+        const maxMana = computeMaxMana(state, effects);
+        const hasEmergencyReserve = hasSpecial(effects, SPECIAL_EFFECTS.EMERGENCY_RESERVE);
+        
         // Keep some spells through temporal memory
         let spellsToKeep: string[] = [];
         if (state.skills.temporalMemory) {
@@ -1045,6 +1078,13 @@ export const useGameStore = create<GameStore>()(
           });
         }
         
+        // EMERGENCY_RESERVE: Keep 10% of max mana when starting new loop
+        if (hasEmergencyReserve) {
+          const reserveMana = Math.floor(maxMana * 0.1);
+          newState.rawMana = reserveMana;
+          newState.log = [`💫 Emergency Reserve preserved ${reserveMana} mana!`, ...newState.log.slice(0, 49)];
+        }
+        
         set(newState);
       },
 

src/lib/game/types.ts

@@ -472,6 +472,11 @@ export interface GameState {
   // Parallel Study Target (for Parallel Mind milestone upgrade)
   parallelStudyTarget: StudyTarget | null;
   
+  // Study tracking for special effects
+  studyStartedAt: number | null;          // Tick when study started (for STUDY_RUSH)
+  consecutiveStudyHours: number;          // Consecutive hours studying (for STUDY_MOMENTUM)
+  lastStudyCost: number;                  // Cost of starting current study (for STUDY_REFUND)
+
   // Prestige
   insight: number;
   totalInsight: number;
@@ -486,6 +491,7 @@ export interface GameState {
   // Combo System
   combo: ComboState;
   totalTicks: number;           // Total ticks this loop (for combo timing)
+  consecutiveHits: number;      // Consecutive hits for BATTLE_FURY tracking
 
   // Loot System
   lootInventory: LootInventory;