Removed explicit exit() from Textual-related classes and functions (#388)

Co-authored by: yxd92326 <[email protected]>

Author: tieneupin

src/murfey/client/tui/app.py

@@ -748,7 +748,6 @@ async def action_quit(self) -> None:
         if self._multigrid_watcher:
             self._multigrid_watcher.stop()
         self.exit()
-        exit()
 
     async def action_remove_session(self) -> None:
         requests.delete(
@@ -763,14 +762,12 @@ async def action_remove_session(self) -> None:
         if self._multigrid_watcher:
             self._multigrid_watcher.stop()
         self.exit()
-        exit()
 
     def clean_up_quit(self) -> None:
         requests.delete(
             f"{self._environment.url.geturl()}/instruments/{self._environment.instrument_name}/clients/{self._environment.client_id}/session"
         )
         self.exit()
-        exit()
 
     async def action_clear(self) -> None:
         machine_config = get_machine_config_client(
@@ -817,7 +814,6 @@ def _remove_data(self, listener: Callable[..., Awaitable[None] | None], **kwargs
             f"{self._environment.url.geturl()}/instruments/{self._environment.instrument_name}/clients/{self._environment.client_id}/session"
         )
         self.exit()
-        exit()
 
     async def action_process(self) -> None:
         self.processing_btn.disabled = False

src/murfey/client/tui/screens.py

@@ -1270,7 +1270,6 @@ def file_copied(self, *args, **kwargs):
                 f"{self.app._environment.url.geturl()}/instruments/{self._environment.instrument_name}/clients/{self.app._environment.client_id}/session"
             )
             self.app.exit()
-            exit()
 
 
 class MainScreen(Screen):