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/crafting-actions/design-actions.ts

@@ -1,6 +1,6 @@
 // ─── Enchantment Design Actions ────────────────────────────────────────────
 
-import type { GameState, EnchantmentDesign, DesignEffect } from '../types';
+import type { GameState, EnchantmentDesign, DesignEffect, DesignProgress } from '../types';
 import * as CraftingUtils from '../crafting-utils';
 import * as CraftingDesign from '../crafting-design';
 import { computeEffects } from '../effects/upgrade-effects';
@@ -35,7 +35,7 @@ export function startDesigningEnchantment(
   const computedEffects = computeEffects(state.skillUpgrades || {}, state.skillTiers || {});
   const hasEnchantMastery = hasSpecial(computedEffects, SPECIAL_EFFECTS.ENCHANT_MASTERY);
 
-  let updates: any = {};
+  let updates: Partial<GameState> = {};
 
   if (!state.designProgress) {
     updates = {