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/combat-actions.ts

@@ -3,7 +3,7 @@
 // All external data (signedPacts, etc.) is passed in as parameters.
 
 import { SPELLS_DEF, GUARDIANS, HOURS_PER_TICK } from '../constants';
-import type { CombatState } from './combat-state.types';
+import type { CombatStore, CombatState } from './combat-state.types';
 import type { SpellState } from '../types';
 import { getFloorMaxHP, getFloorElement, calcDamage, canAffordSpellCost, deductSpellCost } from '../utils';
 import { computeDisciplineEffects } from '../effects/discipline-effects';
@@ -22,7 +22,7 @@ export interface CombatTickResult {
 }
 
 export function processCombatTick(
-  get: () => CombatState,
+  get: () => CombatStore,
   set: (state: Partial<CombatState>) => void,
   rawMana: number,
   elements: Record<string, { current: number; max: number; unlocked: boolean }>,