make sure you can't send another rquest prompt when one is still being processed

src/gui_2.py

@@ -2589,17 +2589,23 @@ def hello():
   ch, self.ui_ai_input = imgui.input_text_multiline("##ai_in", self.ui_ai_input, imgui.ImVec2(-1, -40))
   # Keyboard shortcuts
   io = imgui.get_io()
-  ctrl_enter = io.key_ctrl and imgui.is_key_pressed(imgui.Key.enter)
   ctrl_l = io.key_ctrl and imgui.is_key_pressed(imgui.Key.l)
   if ctrl_l:
    self.ui_ai_input = ""
   imgui.separator()
+  is_busy = self.ai_status in ['sending...', 'streaming...']
   send_busy = False
   with self._send_thread_lock:
    if self.send_thread and self.send_thread.is_alive():
     send_busy = True
-  if (imgui.button("Gen + Send") or ctrl_enter) and not send_busy:
+  if is_busy: send_busy = True
+
+  imgui.begin_disabled(send_busy)
+  ctrl_enter = io.key_ctrl and imgui.is_key_pressed(imgui.Key.enter)
+  label = "Gen + Send (Busy)" if send_busy else "Gen + Send"
+  if (imgui.button(label) or ctrl_enter) and not send_busy:
    self._handle_generate_send()
+  imgui.end_disabled()
   imgui.same_line()
   if imgui.button("MD Only"):
    self._handle_md_only()