✅ Add routing e2e tests

playwright.config.ts

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+import { defineConfig, devices } from '@playwright/test';
+
+export default defineConfig({
+  testDir: './tests/e2e',
+  fullyParallel: true,
+  forbidOnly: !!process.env.CI,
+  retries: process.env.CI ? 2 : 0,
+  workers: process.env.CI ? 1 : undefined,
+  reporter: 'html',
+  use: {
+    baseURL: 'http://localhost:8080',
+    trace: 'on-first-retry',
+    screenshot: 'only-on-failure',
+  },
+
+  projects: [
+    {
+      name: 'chromium',
+      use: { ...devices['Desktop Chrome'] },
+    },
+  ],
+
+  webServer: {
+    command: 'echo "Using existing devcontainer web server"',
+    url: 'http://localhost:8080',
+    reuseExistingServer: true,
+  },
+});

tests/e2e/routing.spec.ts

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+import { test, expect } from '@playwright/test';
+
+test.describe('Routing', () => {
+  test('Acorn handles the welcome route', async ({ page }) => {
+    const response = await page.goto('/welcome/');
+    expect(response?.status()).toBe(200);
+    await expect(page).toHaveURL('/welcome/');
+    await expect(page.locator('h1')).toContainText('Welcome to Radicle');
+  });
+
+  test('WordPress admin routes are not intercepted', async ({ page }) => {
+    const response = await page.goto('/wp-admin/');
+    expect(response?.status()).toBe(302); // Redirect status
+    await expect(page).toHaveURL(/wp-login\.php/);
+  });
+
+  test('WordPress handles non-existent routes with 404', async ({ page }) => {
+    const response = await page.goto('/non-existent-' + Date.now());
+    expect(response?.status()).toBe(404);
+    await expect(page.locator('body')).toContainText('Page not found');
+    await expect(page.locator('body.error404')).toBeVisible();
+  });
+
+  test('WordPress handles default homepage', async ({ page }) => {
+    const response = await page.goto('/');
+    expect(response?.status()).toBe(200);
+    await expect(page.locator('body.home')).toBeVisible();
+  });
+
+  test('WordPress REST API routes work', async ({ request }) => {
+    const response = await request.get('/wp-json/');
+    expect(response.status()).toBe(200);
+    const data = await response.json();
+    expect(data.name).toBeDefined();
+    expect(data.url).toBeDefined();
+  });
+
+  test('WordPress search route works', async ({ page }) => {
+    const response = await page.goto('/?s=test');
+    expect(response?.status()).toBe(200);
+    await expect(page.locator('body.search')).toBeVisible();
+  });
+});