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/__tests__/mana-utils.test.ts

@@ -170,27 +170,27 @@ describe('computeRegen', () => {
 
 describe('computeClickMana', () => {
   it('should return 1 with no skills', () => {
-    const result = computeClickMana({ skills: {} });
+    const result = computeClickMana({});
     expect(result).toBe(1);
   });
 
   it('should add 1 per manaTap skill level', () => {
-    const result = computeClickMana({ skills: { manaTap: 3 } });
+    const result = computeClickMana({ manaTap: 3 });
     expect(result).toBe(4); // 1 + 3
   });
 
   it('should add 3 per manaSurge skill level', () => {
-    const result = computeClickMana({ skills: { manaSurge: 2 } });
+    const result = computeClickMana({ manaSurge: 2 });
     expect(result).toBe(7); // 1 + 6
   });
 
   it('should combine manaTap and manaSurge', () => {
-    const result = computeClickMana({ skills: { manaTap: 2, manaSurge: 1 } });
+    const result = computeClickMana({ manaTap: 2, manaSurge: 1 });
     expect(result).toBe(6); // 1 + 2 + 3
   });
 
   it('should add discipline click multiplier', () => {
-    const result = computeClickMana({ skills: {} }, {
+    const result = computeClickMana({}, {
       bonuses: { clickManaMultiplier: 5 },
       multipliers: {},
     });