Summary by cubic

Make CDP handling more robust and reduce noisy errors during navigation. DOM build now requires only snapshot and dom_tree; ax_tree and device_pixel_ratio are optional with safe defaults.

• Bug Fixes
  • Raise TimeoutError only if snapshot or dom_tree fail; log optional failures as warnings and fall back to empty ax_tree and ratio 1.0.
  • When no lifecycle events are seen after navigation, log a warning with clearer context instead of an error.

^{Written for commit a4c7ea9. Summary will update on new commits.}