fix: resolve priority 4 issues — discipline mutation, skill→discipline migration, uiStore persistence, game loop interval, toast listener leak, page re-renders

- Issue 70: Fix discipline-slice.ts nested element mutation (use immutable spread)
- Issue 71: Add persist middleware to uiStore for paused/gameOver/victory
- Issue 72: Wire discipline effects into calcDamage (spell-casting, void-manipulation)
- Issue 73: Fix useGameLoop interval recreation (use getState() + empty deps)
- Issue 74: Fix use-toast.ts listener leak (change [state] dep to [])
- Issue 75: Reduce page.tsx re-renders with useShallow for multi-field subscriptions
- Issue 76: Fix createGatherMana hardcoded click mana (use computeClickMana with discipline effects)
- Issue 77: Pass discipline effects to computeMaxMana/computeRegen/calcInsight in tick()
- Export DisciplineBonuses type and useDisciplineStore from barrel exports
- Update tests to match new function signatures

src/lib/game/effects.ts

@@ -137,13 +137,13 @@ export function computeAllEffects(
   return merged;
 }
 
-export function getUnifiedEffects(state: Pick<GameState, 'skillUpgrades' | 'skillTiers' | 'equipmentInstances' | 'equippedInstances' | 'disciplines'>): UnifiedEffects {
+export function getUnifiedEffects(state: Pick<GameState, 'skillUpgrades' | 'skillTiers' | 'equipmentInstances' | 'equippedInstances'>): UnifiedEffects {
   return computeAllEffects(
     state.skillUpgrades || {},
     state.skillTiers || {},
     state.equipmentInstances || {},
     state.equippedInstances || {},
-    state as GameState
+    state as unknown as GameState
   );
 }