refactor: split bloated state types into State + Actions interfaces (issue #102)

- CombatState: split into CombatState (data) + CombatActions + CombatStore
- PrestigeState: split into PrestigeState (data) + PrestigeActions + PrestigeStore
- ManaState: split into ManaState (data) + ManaActions + ManaStore
- GameState: deprecated, removed from barrel exports
- crafting-actions: updated to use CraftingState instead of GameState
- combat-utils/mana-utils: replaced Pick<GameState,...> with focused interfaces
- DisciplineCardProps: split into Definition + Runtime + Callbacks
- stores/index.ts: now exports both State and Actions types

src/lib/game/stores/combatStore.ts

@@ -9,9 +9,9 @@ import { usePrestigeStore } from './prestigeStore';
 import { generateFloorState } from '../utils/room-utils';
 import { addActivityLogEntry } from '../utils/activity-log';
 import { processCombatTick, makeInitialSpells } from './combat-actions';
-import type { CombatState } from './combat-state.types';
+import type { CombatStore } from './combat-state.types';
 
-export const useCombatStore = create<CombatState>()(
+export const useCombatStore = create<CombatStore>()(
   persist(
     (set, get) => ({
       currentFloor: 1,