fix: add missing ComboState type and default combo state

- Added ComboState interface to types.ts with count, maxCombo, multiplier, elementChain, decayTimer
- Added combo field to GameState interface
- Added default combo state to makeInitial() in store.ts
- Added combo and attunements to persist partialize function
- Fixes prerender error: 'Cannot read properties of undefined (reading count)'

src/lib/game/store.ts

@@ -466,6 +466,13 @@ function makeInitial(overrides: Partial<GameState> = {}): GameState {
     activeSpell: 'manaBolt',
     currentAction: 'meditate',
     castProgress: 0,
+    combo: {
+      count: 0,
+      maxCombo: 0,
+      multiplier: 1,
+      elementChain: [],
+      decayTimer: 0,
+    },
 
     spells: startSpells,
     skills: overrides.skills || {},
@@ -1669,6 +1676,7 @@ export const useGameStore = create<GameStore>()(
         rawMana: state.rawMana,
         meditateTicks: state.meditateTicks,
         totalManaGathered: state.totalManaGathered,
+        attunements: state.attunements,
         elements: state.elements,
         currentFloor: state.currentFloor,
         floorHP: state.floorHP,
@@ -1678,6 +1686,7 @@ export const useGameStore = create<GameStore>()(
         activeSpell: state.activeSpell,
         currentAction: state.currentAction,
         castProgress: state.castProgress,
+        combo: state.combo,
         spells: state.spells,
         skills: state.skills,
         skillProgress: state.skillProgress,

src/lib/game/types.ts

@@ -270,6 +270,15 @@ export interface StudyTarget {
   required: number;         // Total hours needed
 }
 
+// Combo state for combat
+export interface ComboState {
+  count: number;           // Current combo hits
+  maxCombo: number;        // Highest combo this session
+  multiplier: number;      // Current damage multiplier
+  elementChain: string[];  // Last 3 elements used
+  decayTimer: number;      // Hours until decay starts
+}
+
 export interface GameState {
   // Time
   day: number;
@@ -299,6 +308,7 @@ export interface GameState {
   activeSpell: string;
   currentAction: GameAction;
   castProgress: number;      // Progress towards next spell cast (0-1)
+  combo: ComboState;         // Combat combo tracking
 
   // Spells
   spells: Record<string, SpellState>;