Reset gateway performance on disconnect (#3620)

* rest gateway performance on disconnect

* update mobile context

nym-connect/desktop/src/context/main.tsx

@@ -164,9 +164,15 @@ export const ClientContextProvider: FCWithChildren = ({ children }) => {
     }
   }, []);
 
+  const afterDisconnection = useCallback(async () => {
+    setGatewayPerformance('Good');
+    setConnectedSince(undefined);
+  }, []);
+
   const startDisconnecting = useCallback(async () => {
     try {
       await invoke('start_disconnecting');
+      afterDisconnection();
     } catch (e) {
       console.log(e);
       Sentry.captureException(e);

nym-connect/mobile/src/context/main.tsx

@@ -116,9 +116,15 @@ export const ClientContextProvider: FCWithChildren = ({ children }) => {
     }
   }, []);
 
+  const afterDisconnection = useCallback(async () => {
+    setGatewayPerformance('Good');
+    setConnectedSince(undefined);
+  }, []);
+
   const startDisconnecting = useCallback(async () => {
     try {
       await invoke('start_disconnecting');
+      afterDisconnection();
     } catch (e) {
       console.log(e);
     }