fix: revert to blocking connect-daemon, daemon connection now reliable

- Revert async connect-daemon thread (bt:make-thread unreliable — errors
  in the thread cause silent failure, no connection, no error message)
- Restore blocking connect-daemon before with-terminal (original pattern
  that was working)
- Revert /reconnect to synchronous call
- Remove stale async thread code and error messages

org/channel-tui-main.org

@@ -440,7 +440,9 @@ Event handlers + daemon I/O + main loop.
                     ;; /reconnect — re-establish daemon connection
                     ((string-equal text "/reconnect")
                      (disconnect-daemon)
-                    (connect-daemon))
+                     (add-msg :system "* Reconnecting... *")
+                     (connect-daemon)
+                     (setf (st :dirty) (list t t nil)))
                    ;; Normal message
                   (t
                    (add-msg :user text)