fix: TUI reader-loop — silent timeout handling, sleep on idle

- recv-daemon: catch all errors silently (not just usocket:timeout-error
  which doesn't match SBCL's SB-INT:IO-TIMEOUT). Prevents log-message
  from bleeding through to the Croatoan screen.
- reader-loop: add (sleep 0.5) when recv-daemon returns nil, preventing
  tight spin on repeated I/O timeouts during idle periods.

lisp/gateway-tui-main.lisp

@@ -176,23 +176,25 @@
       (let* ((hdr (make-string 6)) (n 0))
         (loop while (< n 6)
               do (let ((ch (read-char s nil)))
-                   (unless ch (return-from recv-daemon nil))
-                   (setf (char hdr n) ch) (incf n)))
+                    (unless ch (return-from recv-daemon nil))
+                    (setf (char hdr n) ch) (incf n)))
         (let* ((len (parse-integer hdr :radix 16 :junk-allowed t))
                (buf (make-string (or len 0))))
           (when (and len (> len 0))
             (loop for i from 0 below len
                   do (let ((ch (read-char s nil)))
-                       (unless ch (return-from recv-daemon nil))
-                       (setf (char buf i) ch)))
+                        (unless ch (return-from recv-daemon nil))
+                        (setf (char buf i) ch)))
             (let ((*read-eval* nil))
               (read-from-string buf)))))
-    (error (c) (log-message "TUI-RECV: ~a" c) nil)))
+    (error () nil)))
 
 (defun reader-loop (s)
   (loop while (and (st :running) (open-stream-p s))
         do (let ((msg (recv-daemon s)))
-             (when msg (queue-event (list :type :daemon :payload msg))))))
+             (if msg
+                 (queue-event (list :type :daemon :payload msg))
+                 (sleep 0.5)))))
 
 (defun connect-daemon (&optional (host "127.0.0.1") (port 9105))
   (handler-case