feat: add video on test failure

[veljkho]

Adds support for video recording of browser test sessions, automatically saving a .webm video when a test fails. Videos from passing tests are silently deleted to avoid unnecessary disk usage. This is optional just like in Playwright.

Playwright has a native recordVideo context option that writes a .webm file to a directory during the session. The video is finalized when the browser context closes — which already happens in the existing afterEach hook via Playwright::reset(). After reset, the plugin moves the video to tests/Browser/Videos/ on failure, or removes it on success.

Usage

Enable globally in Pest.php:

browser()->recordVideoOnFailure();

or call it via --record-video when running tests.

Videos are .webm format, playable in all modern browsers
No new dependencies — relies entirely on Playwright's built-in recording
Parallel runs are safe since each worker uses its own isolated temp directory

Added unit tests.
Tested locally with a local browser test that intentionally failed.

[nexxai]

Holy crap, yes! This would be amazing.

@nunomaduro please merge!