refactor: eliminate as any type casts across 18 source files

- Fix computeDisciplineEffects() to not require GameState parameter
- Fix getUnifiedEffects() to accept proper partial state type
- Replace upgradeEffects as any with proper UnifiedEffects type
- Replace explicit : any annotations with proper types (ComputedEffects, DesignProgress, SpellDef, etc.)
- Fix activity-log.ts eventType casting
- Fix crafting-design.ts computedEffects and designProgress types
- Fix page.tsx grimoire spell rendering with proper SpellDef property names
- Fix StatsTab ManaStatsSection with proper ManaStatsEffects interface
- Remove unused imports (useDisciplineStore from page.tsx, LeftPanel.tsx)

Remaining: 1 as any in craftingStore.ts (pre-existing CraftingStore/GameState architectural mismatch)

src/lib/game/stores/craftingStore.ts

@@ -2,6 +2,7 @@
 import { create } from 'zustand';
 import { persist } from 'zustand/middleware';
 import type { DesignProgress, EnchantmentDesign, DesignEffect } from '../types';
+import type { EquipmentSlot } from '../types/equipmentSlot';
 import type { CraftingStore, CraftingState } from './craftingStore.types';
 import * as CraftingUtils from '../crafting-utils';
 import * as CraftingDesign from '../crafting-design';
@@ -342,7 +343,7 @@ export const useCraftingStore = create<CraftingStore>()(
             let newEquipped = { ...state.equippedInstances };
             for (const [slot, id] of Object.entries(newEquipped)) {
               if (id === instanceId) {
-                newEquipped[slot as any] = null;
+                newEquipped[slot as EquipmentSlot] = null;
               }
             }