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/stores/uiStore.ts

@@ -2,6 +2,7 @@
 // Handles logs, pause state, and UI-specific state
 
 import { create } from 'zustand';
+import { persist } from 'zustand/middleware';
 
 export interface LogEntry {
   message: string;
@@ -25,40 +26,45 @@ export interface UIState {
 
 const MAX_LOGS = 50;
 
-export const useUIStore = create<UIState>((set) => ({
-  logs: ['✨ The loop begins. You start with Mana Bolt. Gather your strength, mage.'],
-  paused: false,
-  gameOver: false,
-  victory: false,
-
-  addLog: (message: string) => {
-    set((state) => ({
-      logs: [message, ...state.logs.slice(0, MAX_LOGS - 1)],
-    }));
-  },
-
-  clearLogs: () => {
-    set({ logs: [] });
-  },
-
-  togglePause: () => {
-    set((state) => ({ paused: !state.paused }));
-  },
-
-  setPaused: (paused: boolean) => {
-    set({ paused });
-  },
-
-  setGameOver: (gameOver: boolean, victory: boolean = false) => {
-    set({ gameOver, victory });
-  },
-
-  reset: () => {
-    set({
+export const useUIStore = create<UIState>()(
+  persist(
+    (set) => ({
       logs: ['✨ The loop begins. You start with Mana Bolt. Gather your strength, mage.'],
       paused: false,
       gameOver: false,
       victory: false,
-    });
-  },
-}));
+
+      addLog: (message: string) => {
+        set((state) => ({
+          logs: [message, ...state.logs.slice(0, MAX_LOGS - 1)],
+        }));
+      },
+
+      clearLogs: () => {
+        set({ logs: [] });
+      },
+
+      togglePause: () => {
+        set((state) => ({ paused: !state.paused }));
+      },
+
+      setPaused: (paused: boolean) => {
+        set({ paused });
+      },
+
+      setGameOver: (gameOver: boolean, victory: boolean = false) => {
+        set({ gameOver, victory });
+      },
+
+      reset: () => {
+        set({
+          logs: ['✨ The loop begins. You start with Mana Bolt. Gather your strength, mage.'],
+          paused: false,
+          gameOver: false,
+          victory: false,
+        });
+      },
+    }),
+    { name: 'mana-loop-ui-storage' }
+  )
+);