Enhance PathPicker: Regex/File Parsing & Command Mode

[rahmaaismail]

Regex/File Parsing Improvements:

• Improved file detection with advanced regex patterns
• Added support for complex filenames, unicode paths, and deleted git files
• Optimized performance for large file lists

Command Mode Enhancements:

• Added command_mode.py with:
  • expand_tokens for custom token replacement (, , )
  • run_command for safe execution of shell commands with optional confirmation
• Updated screen.py:
  • handle_command_mode for command input
  • clrtoeol to clear input lines
  • Integrated command execution with token expansion
  • Updated input loop to support ':' for command mode

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