Function sanitize_applescript_payload 

pub fn sanitize_applescript_payload(s: &str, max: usize) -> String

Sanitize a string for safe inclusion inside an AppleScript "..." literal.

Steps applied in order (order is important):

1. Replace all ASCII control characters (< 0x20) and Unicode control chars with space (tab \t is also replaced — single-line banners only)
2. Replace newlines \n and carriage returns \r with a single space
3. Truncate to max chars, appending … when cut
4. Strip \ and " — AppleScript does not support backslash escaping inside strings, so these characters must be removed to prevent injection

Examples

let s = sanitize_applescript_payload("Hello\nWorld\"", 200);
assert_eq!(s, "Hello World");