fix: Spire tab maxFloorReached undefined error

docs/context-legacy-store-cleanup.md

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+# Context: Legacy Store Reference Cleanup
+
+## Problem Statement
+Remaining references to the old legacy store (`store.ts` pattern) need to be identified and replaced with modular store imports from `src/lib/game/stores/`.
+
+## Legacy Store Locations to Check
+- `src/lib/game/store.ts` - Main legacy store (to be deprecated)
+- `src/lib/game/store/` - Legacy store slices
+- Any file importing from these legacy paths
+
+## Required Actions
+1. Search entire codebase for imports from:
+   - `src/lib/game/store`
+   - `src/lib/game/store.ts`
+   - Any reference to legacy store patterns
+
+2. Replace with modular store imports:
+   - `useGameStore` from `src/lib/game/stores/gameStore`
+   - `useManaStore` from `src/lib/game/stores/manaStore`
+   - `useCombatStore` from `src/lib/game/stores/combatStore`
+   - `useSkillStore` from `src/lib/game/stores/skillStore`
+   - `usePrestigeStore` from `src/lib/game/stores/prestigeStore`
+   - `useUiStore` from `src/lib/game/stores/uiStore`
+
+## Architecture Rules (from AGENTS.md)
+- NEVER use legacy store pattern
+- All state management must use modular Zustand stores in `src/lib/game/stores/`
+- Use barrel exports from `src/lib/game/stores/index.ts`
+
+## Files to Search
+- All `.ts` and `.tsx` files in `src/`
+- Focus on `src/components/game/` and `src/lib/game/`
+
+## Expected Outcome
+- Zero references to legacy store in codebase
+- All imports use modular store pattern
+- No functional changes (only import path updates)
+- List of fixed files added to commit message