Remove unused mouse control and macax accessibility code

Removed dead code that was never used by any g3 tool:

- macax/ module (accessibility control via AXApplication, AXElement)
- move_mouse() and click_at() methods from ComputerController trait
- macax_demo.rs and test_type_text.rs examples

The ComputerController trait now only has take_screenshot(),
which is the only method actually used by the screenshot tool.

crates/g3-computer-control/src/lib.rs

@@ -1,7 +1,6 @@
 // Suppress warnings from objc crate macros
 #![allow(unexpected_cfgs)]
 
-pub mod macax;
 pub mod platform;
 pub mod types;
 pub mod webdriver;
@@ -12,9 +11,6 @@ pub use webdriver::{
     diagnostics::{run_diagnostics as run_chrome_diagnostics, ChromeDiagnosticReport, DiagnosticStatus},
 };
 
-// Re-export macax types for convenience
-pub use macax::{AXApplication, AXElement, MacAxController};
-
 use anyhow::Result;
 use async_trait::async_trait;
 use types::*;
@@ -28,10 +24,6 @@ pub trait ComputerController: Send + Sync {
         region: Option<Rect>,
         window_id: Option<&str>,
     ) -> Result<()>;
-
-    // Mouse operations
-    fn move_mouse(&self, x: i32, y: i32) -> Result<()>;
-    fn click_at(&self, x: i32, y: i32, app_name: Option<&str>) -> Result<()>;
 }
 
 // Platform-specific constructor