fix: add missing AchievementState type and stats tracking

- Added AchievementDef interface for achievement definitions
- Added AchievementState interface for tracking unlocked achievements
- Added achievements, totalSpellsCast, totalDamageDealt, totalCraftsCompleted to GameState
- Added default values for all new fields in makeInitial()
- Added all new fields to persist partialize function
- Fixes build error with achievements and stats tracking

src/lib/game/store.ts

@@ -481,6 +481,17 @@ function makeInitial(overrides: Partial<GameState> = {}): GameState {
     skillTiers: overrides.skillTiers || {},
     parallelStudyTarget: null,
 
+    // Achievements
+    achievements: {
+      unlocked: [],
+      progress: {},
+    },
+
+    // Stats tracking
+    totalSpellsCast: 0,
+    totalDamageDealt: 0,
+    totalCraftsCompleted: 0,
+
     // New equipment system
     equippedInstances: startingEquipment.equippedInstances,
     equipmentInstances: startingEquipment.equipmentInstances,
@@ -1700,6 +1711,10 @@ export const useGameStore = create<GameStore>()(
         skillTiers: state.skillTiers,
         currentStudyTarget: state.currentStudyTarget,
         parallelStudyTarget: state.parallelStudyTarget,
+        achievements: state.achievements,
+        totalSpellsCast: state.totalSpellsCast,
+        totalDamageDealt: state.totalDamageDealt,
+        totalCraftsCompleted: state.totalCraftsCompleted,
         insight: state.insight,
         totalInsight: state.totalInsight,
         prestigeUpgrades: state.prestigeUpgrades,

src/lib/game/types.ts

@@ -258,6 +258,34 @@ export interface LootInventory {
   blueprints: string[];               // blueprint IDs discovered
 }
 
+// Achievement definitions
+export interface AchievementDef {
+  id: string;
+  name: string;
+  desc: string;
+  category: string;
+  requirement: {
+    type: string;
+    value: number;
+    subType?: string;
+  };
+  reward: {
+    insight?: number;
+    manaBonus?: number;
+    damageBonus?: number;
+    regenBonus?: number;
+    title?: string;
+    unlockEffect?: string;
+  };
+  hidden?: boolean;
+}
+
+// Achievement state tracks unlocked achievements and progress
+export interface AchievementState {
+  unlocked: string[];              // IDs of unlocked achievements
+  progress: Record<string, number>; // Progress toward achievement requirements
+}
+
 export type GameAction = 'meditate' | 'climb' | 'study' | 'craft' | 'repair' | 'convert' | 'design' | 'prepare' | 'enchant';
 
 export interface ScheduleBlock {
@@ -363,6 +391,14 @@ export interface GameState {
   // Parallel Study Target (for Parallel Mind milestone upgrade)
   parallelStudyTarget: StudyTarget | null;
 
+  // Achievements
+  achievements: AchievementState;
+
+  // Stats tracking
+  totalSpellsCast: number;
+  totalDamageDealt: number;
+  totalCraftsCompleted: number;
+
   // Prestige
   insight: number;
   totalInsight: number;