Fix some IO related crashes (#1008)

## Description
- Catch network exceptions when querying to populate the nav drawer
- Perform screensaver work on IO thread
- Fix possible crash if screensaver service runs while regular activity
is destroyed
- Fix genre images & backdrop images not loading

This PR also adds an Jellyfin SDK `ApiClient` wrapper to push all
network calls onto the IO thread. And tries to use a more strict
network-on-main policy for debug builds.

### Related issues
Fixes #994
Fixes #1001
Should fix #1003

### Testing
Emulator with simulated exception throws

## Screenshots
N/A

## AI or LLM usage
None

app/src/main/java/com/github/damontecres/wholphin/MainActivity.kt

@@ -79,8 +79,12 @@ import dagger.hilt.android.AndroidEntryPoint
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.catch
 import kotlinx.coroutines.flow.firstOrNull
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 import okhttp3.OkHttpClient
 import org.jellyfin.sdk.model.api.BaseItemKind
 import org.jellyfin.sdk.model.serializer.toUUIDOrNull
@@ -165,6 +169,20 @@ class MainActivity : AppCompatActivity() {
                 window?.clearFlags(WindowManager.LayoutParams.FLAG_SECURE)
             }
         }
+        screensaverService.keepScreenOn
+            .onEach { keepScreenOn ->
+                Timber.v("keepScreenOn: %s", keepScreenOn)
+                withContext(Dispatchers.Main) {
+                    if (keepScreenOn) {
+                        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
+                    } else {
+                        window.clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
+                    }
+                }
+            }.catch { ex ->
+                Timber.e(ex, "Error with keepScreenOn")
+            }.launchIn(lifecycleScope)
+
         viewModel.appStart()
         setContent {
             val appPreferences by userPreferencesDataStore.data.collectAsState(null)