fix: connect signal BEFORE _refresh (was unreachable on exception), bridge_is_open exception-safe, remove bogus QTimer workaround

toolbar/hermes_bridge.shelf

@@ -28,7 +28,11 @@ def save_config(cfg):
         json.dump(cfg, f, indent=2)
 
 def bridge_is_open(port):
-    return f"Port {port} is open" in hou.hscript("openport")[0]
+    try:
+        out = hou.hscript("openport")[0]
+    except Exception:
+        return False
+    return f"Port {port} is open" in out
 
 # ── Styles ──────────────────────────────────────────
 STYLE_CONNECTED = (
@@ -51,9 +55,9 @@ class HermesBridgeWindow(QtWidgets.QWidget):
         self.port = self.cfg.get("port", DEFAULT_PORT)
         self.hostname = socket.gethostname()
         self._build_ui()
-        self._refresh()
-        # Connect after refresh — style changes don't kill the signal
+        # Connect signals FIRST — _refresh may throw but button must work
         self.btn_toggle.released.connect(self._toggle)
+        self._refresh()
 
     def _build_ui(self):
         self.setWindowTitle("Hermes Bridge")
@@ -129,11 +133,6 @@ class HermesBridgeWindow(QtWidgets.QWidget):
             f"on {self.hostname} (port {self.port}).")
 
     def _toggle(self):
-        # Defer to next event loop cycle — avoids re-entrancy
-        # issues with hou.hscript in signal handler context
-        QtCore.QTimer.singleShot(0, self._execute_toggle)
-
-    def _execute_toggle(self):
         try:
             if bridge_is_open(self.port):
                 hou.hscript(f"closeport {self.port}")