feat: update folder selection to use SafInitialUris for improved document access

app/src/main/java/at/lockstep/player/ui/pairing/PairingScreen.kt

@@ -37,6 +37,7 @@ import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import at.lockstep.jukebox.db.TrackRow
 import at.lockstep.player.LockstepViewModel
 import at.lockstep.player.R
+import at.lockstep.player.util.SafInitialUris
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
@@ -149,7 +150,7 @@ fun PairingScreen(
         ) {
             item {
                 Button(
-                    onClick = { openTree.launch(null) },
+                    onClick = { openTree.launch(SafInitialUris.internalDocuments()) },
                     modifier = Modifier.fillMaxWidth(),
                 ) {
                     Text(context.getString(R.string.pairing_choose_folder))

app/src/main/java/at/lockstep/player/util/SafInitialUris.kt

@@ -0,0 +1,15 @@
+package at.lockstep.player.util
+
+import android.net.Uri
+import android.provider.DocumentsContract
+
+object SafInitialUris {
+    private const val EXTERNAL_STORAGE_AUTHORITY = "com.android.externalstorage.documents"
+
+    /** Internal-storage Documents — avoids the blocked volume root shown on Pixel devices. */
+    fun internalDocuments(): Uri =
+        DocumentsContract.buildDocumentUri(
+            EXTERNAL_STORAGE_AUTHORITY,
+            "primary:Documents",
+        )
+}