feat(details): prevent deletion of downloaded assets on desktop after installation

- Clear `cachedDownloadAssetName` on non-Android platforms when a file is installed or handed off to the system.
- Prevents the `onCleared()` lifecycle method from deleting the downloaded asset once it has been saved to the user's downloads or installed.

Author: rainxchzed

feature/details/presentation/src/commonMain/kotlin/zed/rainxch/details/presentation/DetailsViewModel.kt

@@ -1073,6 +1073,7 @@ class DetailsViewModel(
                 installOutcome = installOutcome,
             )
         } else if (platform != Platform.ANDROID) {
+            cachedDownloadAssetName = null
             viewModelScope.launch {
                 _events.send(DetailsEvent.OnMessage(getString(Res.string.installer_saved_downloads)))
             }