feat(src): adddisplay management commands

Implement display command to query and set refresh rates.

New Features
- Add DisplayCommands with Rates and SetRate subcommands
- Register display command in CLI dispatcher

Enhancements
- Extend command dispatch to handle Display subcommand

Bug Fixes
- None

src/main.rs

@@ -26,6 +26,7 @@ fn main() {
         Commands::Battery { command } => commands::battery::execute(command),
         Commands::Power { command } => commands::power::execute(command),
         Commands::Cooling { command } => commands::cooling::execute(command),
+        Commands::Display { command } => commands::display::execute(command),
         Commands::Status => commands::status::execute(),
         Commands::InstallRules => commands::install_rules::execute(),
         Commands::Touchpad { command } => commands::touchpad::execute(command),