[Mammad3861]

Summary

• Fix streamed interactive installer execution.
• Improve Chromium startup compatibility and verification.
• Use HTTPS as the primary browser access method.
• Bound read-only Docker diagnostics to prevent indefinite blocking.
• Remove unnecessary elevated Docker privileges.
• Add mock integration tests and an Ubuntu GitHub Actions workflow.

Validation

• Bash syntax checks passed.
• Local mock integration tests passed.
• Chromium installation and runtime were successfully tested on Ubuntu 24.04 amd64.
• HTTPS access, Persian input, browsing, and clipboard synchronization were verified.
• Ubuntu 26.04 remains unvalidated; a previous Diagnostics hang could not be reproduced after the server was repurposed.