[hoanle0126]

Change list

Fix three error-handling gaps in MobileErrorHandler.check_response:

• Raise WebDriverException (or the mapped subclass) whenever a response carries a non-zero error status (such as HTTP 401/502 plain-text or HTML proxy responses, flat JSON error objects without an outer value wrapper, or legacy JSONWP numeric status codes) instead of returning silently. Normal HTTP 200 responses and status 0 payloads remain unaffected.
• Extract the alert prompt string from data.text (with fallback to string data or alert.text) when raising UnexpectedAlertPresentException, instead of passing the raw data dict as alert_text.
• Support camelCase stackTrace frames and propagate screen captures when present in error payloads.

Added unit tests in test/unit/webdriver/errorhandler_test.py covering W3C, JSONWP, HTTP proxy/auth errors, unexpected alert text extraction, context exceptions, and mocked driver HTTP responses.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Unit tests added/updated