app: detect CLI availability and add command palette copy action

crates/yaak-common/src/command.rs

@@ -1,4 +1,6 @@
-use std::ffi::OsStr;
+use std::ffi::{OsStr, OsString};
+use std::io::{self, ErrorKind};
+use std::process::Stdio;
 
 #[cfg(target_os = "windows")]
 const CREATE_NO_WINDOW: u32 = 0x0800_0000;
@@ -14,3 +16,27 @@ pub fn new_xplatform_command<S: AsRef<OsStr>>(program: S) -> tokio::process::Com
     }
     cmd
 }
+
+/// Creates a command only if the binary exists and can be invoked with the given probe argument.
+pub async fn new_checked_command<S: AsRef<OsStr>>(
+    program: S,
+    probe_arg: &str,
+) -> io::Result<tokio::process::Command> {
+    let program: OsString = program.as_ref().to_os_string();
+
+    let mut probe = new_xplatform_command(&program);
+    probe.arg(probe_arg).stdin(Stdio::null()).stdout(Stdio::null()).stderr(Stdio::null());
+
+    let status = probe.status().await?;
+    if !status.success() {
+        return Err(io::Error::new(
+            ErrorKind::NotFound,
+            format!(
+                "'{}' is not available on PATH or failed to execute",
+                program.to_string_lossy()
+            ),
+        ));
+    }
+
+    Ok(new_xplatform_command(&program))
+}

crates/yaak-git/src/binary.rs

@@ -1,9 +1,8 @@
 use crate::error::Error::GitNotFound;
 use crate::error::Result;
 use std::path::Path;
-use std::process::Stdio;
 use tokio::process::Command;
-use yaak_common::command::new_xplatform_command;
+use yaak_common::command::new_checked_command;
 
 /// Create a git command that runs in the specified directory
 pub(crate) async fn new_binary_command(dir: &Path) -> Result<Command> {
@@ -14,17 +13,5 @@ pub(crate) async fn new_binary_command(dir: &Path) -> Result<Command> {
 
 /// Create a git command without a specific directory (for global operations)
 pub(crate) async fn new_binary_command_global() -> Result<Command> {
-    // 1. Probe that `git` exists and is runnable
-    let mut probe = new_xplatform_command("git");
-    probe.arg("--version").stdin(Stdio::null()).stdout(Stdio::null()).stderr(Stdio::null());
-
-    let status = probe.status().await.map_err(|_| GitNotFound)?;
-
-    if !status.success() {
-        return Err(GitNotFound);
-    }
-
-    // 2. Build the reusable git command
-    let cmd = new_xplatform_command("git");
-    Ok(cmd)
+    new_checked_command("git", "--version").await.map_err(|_| GitNotFound)
 }