MAESTRO: fix playwright webServer cwd

Auto Run Docs/SpecKit-web-header-analyzer-Phase-10-Playwright-E2E.md

@@ -82,7 +82,7 @@ All tasks in this phase are parallelizable [P] since they are independent E2E sp
 ## Completion
 
 - [x] All Playwright E2E specs pass: `npx playwright test`
-- [ ] Both backend (uvicorn) and frontend (NextJS) start automatically via Playwright `webServer` config
+- [x] Both backend (uvicorn) and frontend (NextJS) start automatically via Playwright `webServer` config
 - [ ] Visual regression baselines committed to `frontend/e2e/__snapshots__/`
 - [ ] Zero axe-core WCAG 2.1 AA violations across all tested views
 - [ ] No horizontal scrollbar or layout issues at any tested viewport (320–2560px)

frontend/playwright.config.ts

@@ -1,4 +1,5 @@
 import { defineConfig, devices } from '@playwright/test';
+import path from 'path';
 
 /**
  * Read environment variables from file.
@@ -76,7 +77,7 @@ export default defineConfig({
       command: 'python -m uvicorn app.main:app --app-dir backend --port 8000',
       url: 'http://localhost:8000',
       reuseExistingServer: !process.env.CI,
-      cwd: '..',
+      cwd: path.resolve(__dirname, '..'),
       env: {
         WHA_CORS_ORIGINS: '["http://localhost:3100"]',
       },
@@ -85,6 +86,7 @@ export default defineConfig({
       command: 'npm run dev -- --port 3100',
       url: 'http://localhost:3100',
       reuseExistingServer: !process.env.CI,
+      cwd: path.resolve(__dirname),
     },
   ],
 });