feat: init ui tests

[phanirithvij]

• closes Add basic Tests for new web interface #20
• closes US: UI test suite #154

playwright test -c ui/tests/e2e
playwright test -c ui/tests/e2e --project=chromium
playwright test -c ui/tests/e2e --project=mobile
playwright test -c ui/tests/e2e --ui
env BASE_URL="https://phanirithvij.github.io/nix-forge/" playwright test -c ui/tests/e2e --ui

[phanirithvij]

Added

• tests for search in options page, home page
• ambient search is tested thoroughly

I had to spend some time to get the tests working on the production deployment as well.

So far here are some assumptions

• python-web and python-web-app will not be removed in production.
• typescript is better suited than python sdk for playwright tests, because we can leverage accessiblilty tests, lighthouse tests.

Some things to consider

• How to provide good command suggestions to the devs, through numtide/devshell some sort of aliases?