fix: fabricator recipes now use correct elemental mana type

- fabricator-recipes.ts: add optional manaType param to canCraftRecipe for clarity
- FabricatorSubTab.tsx: read elemental mana from store based on recipe manaType instead of always using rawMana
- craftingStore.ts: add startFabricatorCrafting action that deducts correct mana type
- craftingStore.types.ts: add startFabricatorCrafting to CraftingActions interface
- crafting-fabricator.ts: new helper file to keep craftingStore.ts under 400 lines

Fixes #155

src/lib/game/crafting-fabricator.ts

@@ -0,0 +1,141 @@
+// ─── Fabricator Crafting Helpers ──────────────────────────────────────────────
+// Separate file to avoid exceeding the 400-line limit in craftingStore.ts.
+
+import type { EquipmentCraftingProgress } from './types';
+import type { FabricatorRecipe } from './data/fabricator-recipes';
+import { FABRICATOR_RECIPES } from './data/fabricator-recipes';
+
+// ─── Lookup ───────────────────────────────────────────────────────────────────
+
+export function getFabricatorRecipe(recipeId: string): FabricatorRecipe | undefined {
+  return FABRICATOR_RECIPES.find(r => r.id === recipeId);
+}
+
+// ─── Cost Check ───────────────────────────────────────────────────────────────
+
+export interface FabricatorCostCheck {
+  canCraft: boolean;
+  missingMana: number;
+  missingMaterials: Record<string, number>;
+}
+
+export function checkFabricatorCosts(
+  recipe: FabricatorRecipe,
+  materials: Record<string, number>,
+  rawMana: number,
+  elements: Record<string, { current: number; max: number; unlocked: boolean }>,
+): FabricatorCostCheck {
+  const missingMaterials: Record<string, number> = {};
+  let canCraft = true;
+
+  for (const [matId, required] of Object.entries(recipe.materials)) {
+    const available = materials[matId] || 0;
+    if (available < required) {
+      missingMaterials[matId] = required - available;
+      canCraft = false;
+    }
+  }
+
+  const manaAvailable = recipe.manaType === 'raw'
+    ? rawMana
+    : (elements[recipe.manaType]?.current ?? 0);
+  const missingMana = Math.max(0, recipe.manaCost - manaAvailable);
+  if (missingMana > 0) canCraft = false;
+
+  return { canCraft, missingMana, missingMaterials };
+}
+
+// ─── Mana Deduction ───────────────────────────────────────────────────────────
+
+export interface ManaDeduction {
+  rawMana: number;
+  elements: Record<string, { current: number; max: number; unlocked: boolean }>;
+}
+
+export function deductFabricatorMana(
+  recipe: FabricatorRecipe,
+  rawMana: number,
+  elements: Record<string, { current: number; max: number; unlocked: boolean }>,
+): ManaDeduction | null {
+  if (recipe.manaType === 'raw') {
+    if (rawMana < recipe.manaCost) return null;
+    return { rawMana: rawMana - recipe.manaCost, elements };
+  }
+
+  const elemState = elements[recipe.manaType];
+  if (!elemState || !elemState.unlocked || elemState.current < recipe.manaCost) return null;
+
+  return {
+    rawMana,
+    elements: {
+      ...elements,
+      [recipe.manaType]: {
+        ...elements[recipe.manaType],
+        current: elements[recipe.manaType].current - recipe.manaCost,
+      },
+    },
+  };
+}
+
+// ─── Mana Refund (on cancel) ──────────────────────────────────────────────────
+
+export interface ManaRefund {
+  rawMana: number;
+  elements: Record<string, { current: number; max: number; unlocked: boolean }>;
+}
+
+export function refundFabricatorMana(
+  recipe: FabricatorRecipe,
+  refundAmount: number,
+  rawMana: number,
+  elements: Record<string, { current: number; max: number; unlocked: boolean }>,
+): ManaRefund {
+  if (recipe.manaType === 'raw') {
+    return { rawMana: rawMana + refundAmount, elements };
+  }
+
+  return {
+    rawMana,
+    elements: {
+      ...elements,
+      [recipe.manaType]: {
+        ...elements[recipe.manaType],
+        current: Math.min(
+          elements[recipe.manaType].max,
+          elements[recipe.manaType].current + refundAmount,
+        ),
+      },
+    },
+  };
+}
+
+// ─── Material Deduction ───────────────────────────────────────────────────────
+
+export function deductMaterials(
+  recipe: FabricatorRecipe,
+  materials: Record<string, number>,
+): Record<string, number> {
+  const newMaterials = { ...materials };
+  for (const [matId, amount] of Object.entries(recipe.materials)) {
+    newMaterials[matId] = (newMaterials[matId] || 0) - amount;
+    if (newMaterials[matId] <= 0) delete newMaterials[matId];
+  }
+  return newMaterials;
+}
+
+// ─── Progress Init ────────────────────────────────────────────────────────────
+
+export function makeFabricatorProgress(
+  recipeId: string,
+  equipmentTypeId: string,
+  craftTime: number,
+  manaCost: number,
+): EquipmentCraftingProgress {
+  return {
+    blueprintId: `fabricator-${recipeId}`,
+    equipmentTypeId,
+    progress: 0,
+    required: craftTime,
+    manaSpent: manaCost,
+  };
+}