Replace async Playwright implementation with sync Playwright reimplementation

[nasif-z]

Important Notes

• This PR reverses the Playwright changes introduced by commits 45316e5, 2d05c5b, 1a02cbd, f77b0bb, and 0f07f81 before applying the replacement implementation.
• Selenium remains the default web automation backend.

Summary/TLDR

• Replace the previous async Playwright implementation with a Selenium-compatible Playwright action layer.
• Preserve existing Selenium workflows while allowing Playwright to be selected at runtime.

Background

The dev branch already contains an earlier Playwright implementation. This branch first reverses that implementation, then adds the newer playwright-actions-v2 work so the two approaches are not combined accidentally.

What Was Added

• A Playwright compatibility layer covering 55 existing Selenium-style actions.
• Runtime routing through the zeuz_browser_driver shared variable.
• Playwright support for locators, frames, tabs, dialogs, downloads, uploads, screenshots, network capture, and browser reuse.
• A Selenium CDP bridge for Playwright-owned Chrome and Edge sessions.
• Firefox and WebKit browser installation support.
• Consolidated Playwright compatibility and configuration tests.

What Was Removed

• The previous async Playwright action implementation and its supporting utilities.
• Superseded Playwright tests and implementation documentation.

What Was Changed

• Updated shared action routing, element lookup, browser lifecycle, timeout handling, and screenshot fallback behavior.
• Preserved the dev branch browser-process cleanup while keeping Playwright operations on their thread-affine worker.
• Updated Playwright documentation, dependencies, browser setup, and local screenshot configuration behavior.

How to Use

• Set the zeuz_browser_driver shared variable to playwright to run compatible Selenium action rows with Playwright.
• Existing Selenium behavior remains unchanged when the variable is not set.
• Explicit playwright action rows can also be used.

How to Set Up

• Install project dependencies normally.
• Use the browser installer when bundled Playwright Firefox or WebKit support is needed.

Tests/Validation

A deployed test set run with ~100 test cases produced similar results with Selenium mode. But the execution speed was faster with Playwright.

• PYTHONPATH=. uv --cache-dir /tmp/uv-cache run pytest tests/test_playwright_compat.py tests/test_config_module.py -q — 38 passed.
• git diff --check origin/dev...HEAD — passed.