docs: update worklog with combo state fix

worklog.md

@@ -281,3 +281,29 @@ Stage Summary:
 - Build errors resolved
 - All imports correctly reference computed-stats.ts for DPS and equipment spell functions
 - Code is cleaner with no duplicate function definitions
+
+---
+Task ID: 12
+Agent: Main
+Task: Fix prerender error - Cannot read properties of undefined (reading 'count')
+
+Work Log:
+- Identified the issue: ComboState type was referenced in ComboMeter.tsx but never defined
+- The `combo` property was also missing from GameState interface and initial state
+- Added ComboState interface to types.ts with:
+  - 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)
+- Added `combo: ComboState` field to GameState interface
+- Added default combo state to makeInitial() in store.ts:
+  - count: 0, maxCombo: 0, multiplier: 1, elementChain: [], decayTimer: 0
+- Added `combo` and `attunements` to persist partialize function for save/load
+- Fixed ComboMeter.tsx to import ComboState from types.ts
+
+Stage Summary:
+- ComboState type properly defined and used
+- combo field now properly initialized in game state
+- Persist function now saves both combo and attunements
+- Build should now pass prerendering stage