Add a functional end-to-end test for the paste create/view flow (Playwright, zero setup)

[qosha1]

What this adds

1 passing functional end-to-end tests (Playwright) covering wastebin:

• Create & view a paste — open the home page, fill the paste form and submit, then follow the redirect to the paste view and assert the pasted content is rendered back.

_{Generated with the help of debugg.ai, then reviewed and run locally before opening. Happy to adjust or drop these if you'd rather not carry them — just say the word.}

Coverage summary

#	Flow
1	Create & view a paste

All 1 tests pass green on a clean checkout — 0 skipped, 0 flaky.

How to run

Standalone Playwright tests under e2e/. They reach the app over HTTP via a configurable BASE_URL.

# start the app, then from e2e/ :
npm install
npx playwright install chromium
BASE_URL=http://localhost:8088 npx playwright test