refactor: tick pipeline pattern — read all → compute all → write all (issue #103)

- New tick-pipeline.ts: TickContext/TickWrites types + buildTickContext/applyTickWrites orchestrator
- gameStore.ts tick(): refactored to 3-phase pipeline (read snapshot → compute updates → batch writes)
- combat-actions.ts: accept signedPacts as parameter instead of usePrestigeStore.getState() in combat loop
- combatStore.ts/combat-state.types.ts: updated processCombatTick signature for signedPacts passthrough
- craftingStore.ts: removed tempState = { ...get(), rawMana } as any anti-pattern
- preparation-actions.ts: accept rawMana as explicit parameter instead of GameState bag

src/lib/game/crafting-actions/preparation-actions.ts

@@ -1,12 +1,13 @@
 // ─── Enchantment Preparation Actions ────────────────────────────────────────
 
-import type { GameState } from '../types';
+import type { CraftingState } from '../stores/craftingStore.types';
 import * as CraftingPrep from '../crafting-prep';
 
 export function startPreparing(
   equipmentInstanceId: string,
-  get: () => GameState,
-  set: (fn: (state: GameState) => Partial<GameState>) => void
+  rawMana: number,
+  get: () => CraftingState,
+  set: (partial: Partial<CraftingState>) => void
 ): boolean {
   const state = get();
   const instance = state.equipmentInstances[equipmentInstanceId];
@@ -21,24 +22,22 @@ export function startPreparing(
 
   const costs = CraftingPrep.calculatePreparationCosts(instance.totalCapacity);
 
-  if (state.rawMana < costs.manaTotal) return false;
+  if (rawMana < costs.manaTotal) return false;
 
-  set(() => ({
-    currentAction: 'prepare' as const,
+  set({
     preparationProgress: CraftingPrep.initializePreparationProgress(
       equipmentInstanceId,
       instance.totalCapacity
     ),
-  }));
+  });
 
   return true;
 }
 
 export function cancelPreparation(
-  set: (fn: (state: GameState) => Partial<GameState>) => void
+  set: (partial: Partial<CraftingState>) => void
 ) {
-  set(() => ({
-    currentAction: 'meditate' as const,
+  set({
     preparationProgress: null,
-  }));
+  });
 }