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

@@ -187,12 +187,14 @@
                         (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

org/gateway-tui-main.org

@@ -218,12 +218,14 @@ Event handlers + daemon I/O + main loop.
                         (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)))))
 #+end_src
 
 ** Connection