test(01-02): add failing tests for item, category, and totals services

- Item CRUD tests: create, getAll, getById, update, delete
- Category CRUD tests: create, getAll, update, delete with reassignment
- Totals tests: per-category and global aggregates

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/services/totals.test.ts

@@ -0,0 +1,79 @@
+import { describe, it, expect, beforeEach } from "bun:test";
+import { createTestDb } from "../helpers/db.ts";
+import { createItem } from "../../src/server/services/item.service.ts";
+import { createCategory } from "../../src/server/services/category.service.ts";
+import {
+  getCategoryTotals,
+  getGlobalTotals,
+} from "../../src/server/services/totals.service.ts";
+
+describe("Totals Service", () => {
+  let db: ReturnType<typeof createTestDb>;
+
+  beforeEach(() => {
+    db = createTestDb();
+  });
+
+  describe("getCategoryTotals", () => {
+    it("returns weight sum, cost sum, item count per category", () => {
+      const shelter = createCategory(db, { name: "Shelter", emoji: "\u{26FA}" });
+      createItem(db, {
+        name: "Tent",
+        weightGrams: 1200,
+        priceCents: 35000,
+        categoryId: shelter!.id,
+      });
+      createItem(db, {
+        name: "Tarp",
+        weightGrams: 300,
+        priceCents: 8000,
+        categoryId: shelter!.id,
+      });
+
+      const totals = getCategoryTotals(db);
+      expect(totals).toHaveLength(1); // Only Shelter has items
+      expect(totals[0].categoryName).toBe("Shelter");
+      expect(totals[0].totalWeight).toBe(1500);
+      expect(totals[0].totalCost).toBe(43000);
+      expect(totals[0].itemCount).toBe(2);
+    });
+
+    it("excludes empty categories (no items)", () => {
+      createCategory(db, { name: "Shelter", emoji: "\u{26FA}" });
+      // No items added
+      const totals = getCategoryTotals(db);
+      expect(totals).toHaveLength(0);
+    });
+  });
+
+  describe("getGlobalTotals", () => {
+    it("returns overall weight, cost, count", () => {
+      createItem(db, {
+        name: "Tent",
+        weightGrams: 1200,
+        priceCents: 35000,
+        categoryId: 1,
+      });
+      createItem(db, {
+        name: "Spork",
+        weightGrams: 20,
+        priceCents: 500,
+        categoryId: 1,
+      });
+
+      const totals = getGlobalTotals(db);
+      expect(totals).toBeDefined();
+      expect(totals!.totalWeight).toBe(1220);
+      expect(totals!.totalCost).toBe(35500);
+      expect(totals!.itemCount).toBe(2);
+    });
+
+    it("returns zeros when no items exist", () => {
+      const totals = getGlobalTotals(db);
+      expect(totals).toBeDefined();
+      expect(totals!.totalWeight).toBe(0);
+      expect(totals!.totalCost).toBe(0);
+      expect(totals!.itemCount).toBe(0);
+    });
+  });
+});