fix: use UUID parser for validation

crates/aether-gateway/frontdoor/src/request_id.rs

@@ -25,26 +25,7 @@ pub fn short_request_id(value: &str) -> String {
 }
 
 fn looks_like_uuid(value: &str) -> bool {
-    let bytes = value.as_bytes();
-    if bytes.len() != 36 {
-        return false;
-    }
-
-    for (index, byte) in bytes.iter().enumerate() {
-        let is_hyphen = matches!(index, 8 | 13 | 18 | 23);
-        if is_hyphen {
-            if *byte != b'-' {
-                return false;
-            }
-            continue;
-        }
-
-        if !byte.is_ascii_hexdigit() {
-            return false;
-        }
-    }
-
-    true
+    value.len() == 36 && uuid::Uuid::parse_str(value).is_ok()
 }
 
 #[cfg(test)]

crates/aether-oauth/src/provider/providers/kiro.rs

@@ -581,12 +581,7 @@ pub fn normalize_kiro_machine_id(raw: &str) -> Option<String> {
     if raw.len() == 64 && raw.bytes().all(|byte| byte.is_ascii_hexdigit()) {
         return Some(raw.to_ascii_lowercase());
     }
-    if raw.len() == 36
-        && raw.chars().enumerate().all(|(idx, ch)| match idx {
-            8 | 13 | 18 | 23 => ch == '-',
-            _ => ch.is_ascii_hexdigit(),
-        })
-    {
+    if raw.len() == 36 && uuid::Uuid::parse_str(raw).is_ok() {
         let normalized = raw.replace('-', "").to_ascii_lowercase();
         return Some(format!("{normalized}{normalized}"));
     }