feat(e2e): add Playwright end-to-end tests for authentication, GRN, production, stock transfers, and adjustments

- Introduced Playwright configuration for e2e testing.
- Implemented authentication tests to validate login functionality.
- Created tests for GRN (Goods Receipt Note) to ensure proper stock handling.
- Developed production run tests to verify lifecycle and stock posting.
- Added stock transfer tests to check movement between warehouses.
- Implemented stock adjustment tests for positive and negative adjustments.
- Established API seeder for test data setup and verification.
- Enhanced utility functions for UI interactions and response handling.

Testing/e2e/pages/LoginPage.ts

@@ -0,0 +1,23 @@
+import { Page, expect } from "@playwright/test"
+
+export class LoginPage {
+  constructor(private readonly page: Page) {}
+
+  async goto() {
+    await this.page.goto("/login")
+  }
+
+  async login(email: string, password: string) {
+    await this.page.locator("#email").fill(email)
+    await this.page.locator("#password").fill(password)
+    await this.page.getByRole("button", { name: /sign in/i }).click()
+  }
+
+  async expectLoggedIn() {
+    await expect(this.page).toHaveURL(/\/dashboard/)
+  }
+
+  async expectError() {
+    await expect(this.page.getByRole("alert")).toBeVisible()
+  }
+}