Add Playwright E2E tests replacing Cypress with MSW integration

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -28,7 +28,7 @@ and [Tailwind CSS][tailwind].
 | UI | PrimeVue 4, PrimeIcons, SweetAlert2 |
 | Visualization | Cytoscape.js (process maps), Chart.js (charts) |
 | HTTP | Axios with JWT refresh token handling |
-| Testing | Vitest 4 (unit/component), Cypress 15 (E2E) |
+| Testing | Vitest 4 (unit/component), [Playwright][playwright] (E2E), [MSW][msw] (API mocking) |
 | Linting | ESLint, Prettier |
 
 
@@ -80,18 +80,18 @@ npx vitest run
 
 ### Run E2E tests
 
-Build first, then run [Cypress][cypress] against the preview
-server:
+Build with MSW enabled first, then run [Playwright][playwright]:
 
 ```sh
-npm run build
+npm run build:e2e
 npm run test:e2e
 ```
 
-For interactive E2E development with the Vite dev server:
+For interactive E2E development with the Playwright UI:
 
 ```sh
-npm run test:e2e:dev
+npm run build:e2e
+npm run test:e2e:ui
 ```
 
 
@@ -169,6 +169,7 @@ Code quality improvements assisted by [Claude Code][claude-code].
 [cytoscape]: https://js.cytoscape.org/
 [chartjs]: https://www.chartjs.org/
 [nodejs]: https://nodejs.org/
-[cypress]: https://www.cypress.io/
+[playwright]: https://playwright.dev/
+[msw]: https://mswjs.io/
 [typedoc]: https://typedoc.org/
 [claude-code]: https://claude.ai/claude-code