[GUI] find_daemon_binary walks entire directory tree without depth limit

[Vantalens]

File: packages/gui/src-tauri/src/lib.rs:184

Severity: Low

Description:
If cwd is deep in filesystem (e.g., /home/user/projects/a/b/c/d/e/f), traverses dozens of directories checking each for codepanion-rust/target/*/; slow startup on slow disks or network mounts.

Code:

let mut dir = env::current_dir().ok();
while let Some(current) = dir {
    // check for daemon binary
    dir = current.parent().map(Path::to_path_buf);
}

Failure Scenario:

• GUI launched from deeply nested project directory
• Searches parent → grandparent → ... → filesystem root
• On Windows with network drives or slow HDD: 5-10 second startup delay
• User experiences 'Starting CodePanion...' freeze

Suggested Fix:
Limit traversal to 10 levels or check for git root as boundary.