Improved lifecycle handling & code clean up (#1653)

## Description
Add some improvements related to life cycle handling whenever the app is
resumed:
- Refreshing the server-side user config 
- Refreshing the home page automatically

Also 401/403 errors accessing recording folders will be skipped since
this typically means the user lost access while the app was running.
Refreshing the server-side user config (above) will also help with this.

Finally, there's some general code clean up in `MainActivity` to move
non-UI related code out of Compose.

### Related issues
Closes #1647

### Testing
Emulator

## Screenshots
N/A

## AI or LLM usage
None

app/src/main/java/com/github/damontecres/wholphin/ui/main/HomePage.kt

@@ -44,6 +44,7 @@ import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.DpSize
 import androidx.compose.ui.unit.dp
 import androidx.hilt.lifecycle.viewmodel.compose.hiltViewModel
+import androidx.lifecycle.compose.LifecycleStartEffect
 import androidx.tv.material3.MaterialTheme
 import androidx.tv.material3.Text
 import com.github.damontecres.wholphin.R
@@ -103,8 +104,9 @@ fun HomePage(
     playlistViewModel: AddPlaylistViewModel = hiltViewModel(),
 ) {
     val context = LocalContext.current
-    LaunchedEffect(Unit) {
+    LifecycleStartEffect(Unit) {
         viewModel.init()
+        onStopOrDispose { }
     }
     val state by viewModel.state.collectAsState()
     val loading = state.loadingState