Report missing dependencies with an actionable message

[kbond]

Forgetting vendor/bin/playwright-install after composer require currently gets you DisconnectedException: Process exited with code 1. The Node stderr explaining why is read in ProcessJsonRpcClient and then only logged as a warning.

This includes that stderr in the exception, and recognises three setup problems as a new MissingDependencyException:

What's wrong	Message
Server not installed	The Playwright server is not installed. Run vendor/bin/playwright-install --browsers to install it.
Browsers not installed	The requested browser is not installed. Run vendor/bin/playwright-install --browsers to download it.
Host libraries missing	The host is missing system libraries the browsers need. Run vendor/bin/playwright-install --with-deps to install them.

Playwright detects the last two itself but points at npx playwright install / install-deps; its original output is kept below ours. Also fixes ServerFinder::findServer(), which threw NetworkException('… npm install playwright').

Detection is by substring match on Playwright's messages.

[codecov]

Codecov Report

❌ Patch coverage is 94.11765% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/Transport/JsonRpc/ProcessJsonRpcClient.php	80.00%	2 Missing ⚠️

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