fix(extension): handle browser error pages gracefully

- Treat chrome error page script failures as transient during injection retries.
- Return safe fallback values for read-only DOM commands when tabs land on browser error pages.
- Improve URL watch handling by checking pending URLs and reporting last seen URL/status on timeout.
- Bump package and extension version to 0.9.6 and add regression coverage for error-page behavior.

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "browser-cli"
-version = "0.9.5"
+version = "0.9.6"
 description = "Control your real running browser from the terminal via a browser extension"
 requires-python = ">=3.10"
 dependencies = [