[skip ci] fix: startup issues in gateway

fluxer_gateway/src/gateway/fluxer_gateway_app.erl

@@ -25,6 +25,7 @@ start(_StartType, _StartArgs) ->
     otel_metrics:init(),
     passive_sync_registry:init(),
     guild_counts_cache:init(),
+    {ok, Pid} = fluxer_gateway_sup:start_link(),
     Port = fluxer_gateway_env:get(port),
     Dispatch = cowboy_router:compile([
         {'_', [
@@ -37,7 +38,7 @@ start(_StartType, _StartArgs) ->
         env => #{dispatch => Dispatch},
         max_frame_size => 4096
     }),
-    fluxer_gateway_sup:start_link().
+    {ok, Pid}.
 
 -spec stop(term()) -> ok.
 stop(_State) ->

fluxer_gateway/src/session/session_connection.erl

@@ -67,7 +67,7 @@ handle_presence_connect(Attempt, State) ->
             group_dm_recipients => GroupDmRecipients,
             custom_status => maps:get(custom_status, State, null)
         }},
-    case gen_server:call(presence_manager, Message, 5000) of
+    try gen_server:call(presence_manager, Message, 5000) of
         {ok, Pid} ->
             try_presence_session_connect(
                 Pid,
@@ -83,6 +83,13 @@ handle_presence_connect(Attempt, State) ->
             );
         _ ->
             schedule_presence_retry(Attempt, State)
+    catch
+        exit:{noproc, _} ->
+            schedule_presence_retry(Attempt, State);
+        exit:{normal, _} ->
+            schedule_presence_retry(Attempt, State);
+        _:_ ->
+            schedule_presence_retry(Attempt, State)
     end.
 
 -spec try_presence_session_connect(