fix(@desktop): enable the hover effects by default

Close #6254

- since Qt 5.xy, hover is not enabled by default for QQC2, so enable it
unconditionally as we are a desktop app anyway
- this fixes several hover effects being broken, mostly for builtin
components like MenuItem and some buttons (eg. the leftmost NavBar)
where we haven't enabled those with `hoverEnabled: true` explicitely

src/nim_status_client.nim

@@ -95,6 +95,7 @@ proc mainProc() =
   installSelfSignedCertificate(imageCert)
 
   let app = newQGuiApplication()
+  os.putEnv("QT_QUICK_CONTROLS_HOVER_ENABLED", "1")
   let appController = newAppController(statusFoundation)
   let singleInstance = newSingleInstance($toMD5(DATADIR), openUri)
   let networkAccessFactory = newQNetworkAccessManagerFactory(TMPDIR & "netcache")