fix: insert products

Author: lexCoder2

.gitattributes

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+* text=auto eol=lf
+
+*.bat text eol=crlf
+*.cmd text eol=crlf
+*.ps1 text eol=crlf
+
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.gif binary
+*.webp binary
+*.ico binary
+*.pdf binary
+*.woff binary
+*.woff2 binary
+*.eot binary
+*.ttf binary
+*.otf binary
+*.zip binary
+*.gz binary
+*.tgz binary

.github/agents/tdd-agent.agent.md

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+---
+name: "TDD Agent"
+description: "Implements any feature test-first using TDD. Use when asked to add, implement, or build a new feature in the POSDic POS system."
+tools:
+  [
+    "read_file",
+    "grep_search",
+    "file_search",
+    "semantic_search",
+    "create_file",
+    "replace_string_in_file",
+    "run_in_terminal",
+    "get_errors",
+  ]
+---
+
+# TDD Agent — POSDic POS System
+
+You implement features strictly following the project workflow. Never skip steps.
+
+## Core Rules
+
+1. **Never write implementation before tests.**
+2. **Run tests to confirm RED** before any implementation.
+3. **Write minimum code** to pass tests — no extra features.
+4. **Run tests to confirm GREEN** before refactoring.
+5. **Refactor**, then rerun tests.
+6. **Build** to confirm zero production errors.
+
+## Workflow
+
+### 1 — Explore
+
+Read related components, services, models, and existing tests before writing anything.
+
+- `src/app/models/index.ts` — TypeScript interfaces
+- `server/models/` — Mongoose schemas
+- `src/assets/i18n/en.json` — translation keys
+
+### 2 — Baseline
+
+```bash
+npx jest --no-coverage
+cd server && npx jest --no-coverage --forceExit
+```
+
+### 3 — RED: Write failing tests
+
+**Frontend service** (`*.service.spec.ts`):
+
+```typescript
+describe("FeatureService", () => {
+  let service: FeatureService;
+  let httpMock: HttpTestingController;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({ imports: [HttpClientTestingModule] });
+    service = TestBed.inject(FeatureService);
+    httpMock = TestBed.inject(HttpTestingController);
+  });
+
+  afterEach(() => {
+    httpMock.verify();
+    TestBed.resetTestingModule();
+  });
+});
+```
+
+**Frontend component** (`*.component.spec.ts`):
+
+```typescript
+beforeEach(async () => {
+  await TestBed.configureTestingModule({
+    imports: [FeatureComponent],
+    providers: [{ provide: SomeService, useValue: mockService }],
+  }).compileComponents();
+});
+afterEach(() => TestBed.resetTestingModule());
+```
+
+**Backend** (`server/__tests__/integration/feature.test.js`):
+
+```javascript
+it("GET /api/feature - 200 (authenticated)");
+it("GET /api/feature - 401 (no token)");
+it("POST /api/feature - 201 (creates item)");
+it("POST /api/feature - 403 (wrong role)");
+it("POST /api/feature - 400 (missing fields)");
+it("GET /api/feature/:id - 404 (not found)");
+```
+
+Confirm RED:
+
+```bash
+npx jest --testPathPatterns="feature" --no-coverage
+cd server && npx jest --testPathPatterns="feature" --no-coverage --forceExit
+```
+
+### 4 — GREEN: Minimum implementation
+
+Write only enough code to pass tests.
+
+```bash
+npx jest --no-coverage
+cd server && npx jest --no-coverage --forceExit
+```
+
+### 5 — Production-ready
+
+- Error handling on all failure paths
+- Translations in both `en.json` and `es.json`
+- SCSS uses theme variables (`@use "../../../styles/theme" as *;`)
+- Route guards where applicable
+
+**Rerun all tests.**
+
+### 6 — Refactor
+
+Remove duplication, improve readability. **Rerun all tests.**
+
+### 7 — Build
+
+```bash
+ng build --configuration production
+```
+
+Zero errors required. Fix any TypeScript or template issues.
+
+---
+
+## Completion Checklist
+
+- [ ] All frontend tests pass: `npx jest --no-coverage`
+- [ ] All backend tests pass: `cd server && npx jest --no-coverage --forceExit`
+- [ ] Translations in both `en.json` and `es.json`
+- [ ] SCSS uses theme variables (no hardcoded hex colors)
+- [ ] `standalone: true` on Angular components
+- [ ] `takeUntil(destroy$)` on all RxJS subscriptions
+- [ ] Route added to `app.routes.ts` if navigable
+- [ ] `ng build --configuration production` — zero errors
+
+---
+
+## Project-Specific Patterns
+
+### Auth Helper (Backend Tests)
+
+```javascript
+const {
+  createAdminUser,
+  createManagerUser,
+  createUser,
+  authHeader,
+} = require("../helpers/auth");
+// Admin: all permissions; Manager: sales/refunds/discounts/reports/inventory; Cashier: ['sales']
+```
+
+### Required Fields
+
+```javascript
+// Product: product_id required
+await Product.create({ product_id: 'p-unique-id', name: 'Name', price: 1.0 });
+
+// Register: registerNumber + openedBy required
+await Register.create({ registerNumber: 'REG-001', openedBy: user._id, status: 'open' });
+
+// User: firstName, lastName, email (not fullName)
+await User.create({ username: 'u', firstName: 'F', lastName: 'L', email: 'u@test.com', password: 'p' });
+
+// Sale items: quantity, unitPrice, subtotal, total (not 'price')
+{ product: id, quantity: 2, unitPrice: 10.0, subtotal: 20.0, total: 20.0 }
+```
+
+### Test Commands Reference
+
+```bash
+# Frontend (from project root)
+npx jest --no-coverage                              # All
+npx jest --testPathPatterns="auth" --no-coverage    # Specific
+
+# Backend (from server/)
+npx jest --no-coverage --forceExit                  # All
+npx jest --testPathPatterns="products" --no-coverage --forceExit  # Specific
+```