Fix CR in auth header

Normalize Windows CRLF line endings out of the serialized PGP public/private key segments in the robot Authorization header. Raw carriage-return characters produce an HTTP-invalid header value, causing window.fetch to throw TypeError: invalid header value on every authenticated request (web, desktop, and Android). Switching from split('\n').join('\\') to replace(/[\r\n]+/g, '\\') strips both CR and LF before they ever reach the header, while preserving the backslash-separated key contract expected by the coordinator (api/utils.py).

Author: gabbygator184

frontend/src/models/Robot.model.ts

@@ -44,8 +44,8 @@ class Robot {
       tokenSHA256,
       nostrPubkey,
       keys: {
-        pubKey: pubKey.split('\n').join('\\'),
-        encPrivKey: encPrivKey.split('\n').join('\\'),
+        pubKey: pubKey.replace(/[\r\n]+/g, '\\'),
+        encPrivKey: encPrivKey.replace(/[\r\n]+/g, '\\'),
       },
     };
   };