feat: update version and dependencies in setup.py; add privilege management and process handling modules

- Updated version from 2026.05.31 to 2026.06.11 in setup.py
- Replaced 'textual' with 'rich' in install_requires
- Added privilege.py for managing sudo privileges with a keep-alive mechanism
- Introduced process.py for handling subprocesses with enhanced control and output streaming
- Created ui.py for unified console interactions and user prompts

setup.py

@@ -2,12 +2,12 @@ from setuptools import setup, find_packages
 
 setup(
     name="lightweight-cobot",
-    version="2026.05.31",
+    version="2026.06.11",
     description="CLI tool for installing, configuring and managing the ROS 2 cobot workspace",
     packages=find_packages(),
     python_requires=">=3.11",
     install_requires=[
-        "textual",
+        "rich",
         "ruamel.yaml",
     ],
     entry_points={