refactor: replace custom isatty implementation with is-terminal crate

Co-authored-by: aider (openai/andrew/openrouter/qwen/qwen3-coder) <aider@aider.chat>

src/modes/get.rs

@@ -6,6 +6,7 @@ use crate::common::is_binary::is_binary;
 use clap::Command;
 use std::path::PathBuf;
 use std::str::FromStr;
+use is_terminal::IsTerminal;
 
 pub fn mode_get(
     cmd: &mut Command,
@@ -46,7 +47,7 @@ pub fn mode_get(
         item_path.push(item_id.to_string());
 
         // Determine if we should detect binary data
-        let mut detect_binary = !args.options.force && is_stdout_tty();
+        let mut detect_binary = !args.options.force && std::io::stdout().is_terminal();
 
         // If we're detecting binary and there's binary metadata, check it
         if detect_binary {
@@ -94,21 +95,3 @@ pub fn mode_get(
         Err(anyhow!("Unable to find matching item in database"))
     }
 }
-
-fn is_stdout_tty() -> bool {
-    #[cfg(unix)]
-    unsafe {
-        libc::isatty(libc::STDOUT_FILENO) != 0
-    }
-
-    #[cfg(windows)]
-    unsafe {
-        let stdout_handle = winapi::um::processenv::GetStdHandle(winapi::um::winbase::STD_OUTPUT_HANDLE);
-        let mut console_mode: winapi::shared::minwindef::DWORD = 0;
-        winapi::um::consoleapi::GetConsoleMode(stdout_handle, &mut console_mode) != 0
-    }
-
-    // Fallback for non-unix platforms or if we can't determine
-    #[cfg(not(any(unix, windows)))]
-    false
-}