fix: two error messages for failed authentication

src/dumdum/client/app.py

@@ -13,6 +13,7 @@
 )
 
 from .async_client import AsyncClient
+from .errors import AuthenticationFailedError
 from .event_thread import EventThread
 from .store import ClientStore
 
@@ -150,6 +151,12 @@ def _on_connection_lost(self, event: Event) -> None:
         elif isinstance(exc, asyncio.CancelledError):
             # The user wants to close the GUI
             return
+        elif (
+            isinstance(exc, BaseExceptionGroup)
+            and exc.subgroup(AuthenticationFailedError) is not None
+        ):
+            # Handled via ClientEventAuthentication
+            return
         else:
             log.error("Lost connection with server", exc_info=exc)
             messagebox.showerror("Connection Lost", str(exc))

src/dumdum/client/async_client.py

@@ -9,6 +9,8 @@
     ClientEventIncompatibleVersion,
 )
 
+from .errors import AuthenticationFailedError
+
 
 class AsyncClient:
     _reader: asyncio.StreamReader | None
@@ -51,7 +53,7 @@ async def connect(self, host: str, port: int) -> AsyncIterator[Self]:
             try:
                 success = await self._handshake()
                 if not success:
-                    raise RuntimeError("Could not authenticate with server")
+                    raise AuthenticationFailedError()
 
                 yield self
             finally: