[feature] Ability to select which browser playwright uses

**Version and OS**
Docker on Synology

**Is your feature request related to a problem? Please describe.**
A problem with a specific site that detects bots

**Describe the solution you'd like**
I played with a local playwright version and it seems that if I change the browser to webkit, that site loads ok so I would like the option to choose the browser type

Start by tracing where Playwright is initialized and where browser-related settings enter the monitoring flow; the issue does not name files or tests. Determine how a user would choose a browser type, then verify that the selected browser is used for monitored pages and that the existing default behavior remains intact.

Written by the indexing model from the issue text.