Update worklog with audit findings

worklog.md

@@ -774,3 +774,63 @@ Stage Summary:
 - Mobile UI is now responsive with properly wrapping tabs
 - Calendar displays correctly on all screen sizes
 - All changes committed and pushed to Gitea
+
+---
+Task ID: 2
+Agent: Main
+Task: Comprehensive codebase audit and bug fixes
+
+Work Log:
+- **Fixed Critical Syntax Errors**:
+  - Missing `[` brackets in `startCraftingEquipment` and `deleteMaterial` in store.ts
+  - Same syntax errors in crafting-slice.ts
+  - These were causing runtime failures in crafting and material deletion
+- **Fixed State Mutation Issues**:
+  - Deep cloned `lootInventory` before mutation in tick function
+  - Created new objects for `materials`, `essence`, and `blueprints` to prevent state mutation
+- **Fixed Race Condition**:
+  - Removed mid-tick `set()` call that could cause inconsistent state
+  - All state updates now happen in the final `set()` call
+- **Fixed Logic Errors**:
+  - COMBO_MASTER now uses `totalSpellsCast` instead of `totalTicks` for accurate hit counting
+  - `deductSpellCost()` now clamps mana to 0 to prevent negative values
+  - `hasSpecial()` now handles undefined/null specials gracefully
+- **Set Up Test Framework**:
+  - Installed Vitest testing framework
+  - Created vitest.config.ts
+  - Added 36 tests for computed-stats and upgrade-effects
+  - All tests passing
+
+Stage Summary:
+- 6 critical bugs fixed
+- Test framework established with 36 passing tests
+- Code quality improved with null safety checks
+- All changes committed and pushed to Gitea
+
+---
+## Outstanding Issues Found During Audit
+
+### Unimplemented Special Effects (Tier 1 - Players Can Select):
+1. `ARMOR_PIERCE` - Ignore 10% floor defense
+2. `FLOW_SURGE` - Clicks restore 2x regen for 1 hour
+3. `MANA_EQUILIBRIUM` - Overflow regen converts to insight
+4. `PERFECT_MEMORY` - Never lose study progress on cancel
+5. `QUICK_MASTERY` - -20% study time for final 3 levels
+6. `PARALLEL_STUDY` - Study 2 things at 50% speed each
+7. `STUDY_INSIGHT` - Gain 1 insight per hour studied
+8. `KNOWLEDGE_TRANSFER` - New skills start at 10% progress
+9. `FREE_STUDY` - 10% chance study costs no mana
+10. `MIND_PALACE` - Keep 1 skill level across loops
+11. `CHAIN_STUDY` - -5% cost per maxed skill
+12. `ELEMENTAL_HARMONY` - +5% damage for matching element spells
+13. `DEEP_STORAGE` - New elements start at 5 capacity
+14. `DOUBLE_CRAFT` - Crafting creates 2 elements
+15. `ELEMENTAL_RESONANCE` - Using element spells restores 1 element
+16. `PURE_ELEMENTS` - Exotic elements give 3x damage bonus
+
+### Large Files Needing Refactoring:
+1. `store.ts` - 1,712 lines - Split tick logic into modules
+2. `CraftingTab.tsx` - 1,013 lines - Split into stage components
+3. `constants.ts` - 862 lines - Split into domain files
+4. `skill-evolution.ts` - 797 lines - Split into per-skill files
+5. `crafting-slice.ts` - 795 lines - Split crafting from equipment