v1.1.1: fixes from verification

Found by an independent verification pass.

Fixed

• Scenes with Windows (CRLF) line endings failed with a misleading CSP error. The build now hashes the text the browser sees.
• motion new some/dir/name failed with a raw bash error when the folder did not exist; it now creates it.
• A missing Chrome printed two errors, the second with wrong advice; now one message that points at motion doctor.
• test/run.sh stops early with a clear message when node or python3 is missing.
• Docs no longer assume the git-clone path for motion doctor and the voice setup; plugin installs are covered.