add sudo fallback

[Sundownersport]

Changes Made:

1. Cargo.toml (line 34)

• Added which = "6.0" dependency for detecting available privilege escalation tools

2. src/main.rs

• Added use std::path::Path; import
• Created 4 helper functions:
  • launch_with_pkexec() - Uses pkexec (PolicyKit) with environment variable preservation
  • launch_with_sudo_terminal() - Launches sudo in a terminal emulator (tries 6 different terminals)
  • launch_with_kdesudo() - KDE's graphical sudo
  • launch_with_gksudo() - Older GNOME/GTK graphical sudo
• Updated check_and_request_privileges() to implement the fallback chain: a. pkexec (most GUI-friendly, modern systems) b. kdesudo (KDE environments) c. gksudo (older GNOME systems) d. sudo in terminal (universal fallback - works on any Linux with sudo) e. Helpful error message if all methods fail

Key Features:

• Wide compatibility: Now works on Debian-based systems without PolicyKit
• Terminal emulator detection: Tries 6 different terminals (x-terminal-emulator, gnome-terminal, konsole, xfce4-terminal, mate-terminal, xterm)
• Preserves environment: DISPLAY and other GUI variables are passed through for each method
• Clear user feedback: Informative error messages if privilege escalation fails
• Non-invasive: Only tries methods that are actually installed on the system