fix: take persistable SAF URI permission on folder selection

Without calling takePersistableUriPermission, the content:// URI
permission granted by ACTION_OPEN_DOCUMENT_TREE is revoked on
app reinstall, causing Permission Denial errors during sync.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/src/main/kotlin/com/syncflow/ui/addpair/AddPairScreen.kt

@@ -1,5 +1,6 @@
 package com.syncflow.ui.addpair
 
+import android.content.Intent
 import android.net.Uri
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
@@ -14,6 +15,7 @@ import androidx.compose.material3.*
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.input.ImeAction
 import androidx.compose.ui.text.input.KeyboardType
@@ -29,10 +31,17 @@ fun AddPairScreen(onDone: () -> Unit, vm: AddPairViewModel = hiltViewModel()) {
     val s by vm.state.collectAsState()
     LaunchedEffect(s.done) { if (s.done) onDone() }
 
+    val context = LocalContext.current
     var showRemoteBrowser by remember { mutableStateOf(false) }
 
     val dirPicker = rememberLauncherForActivityResult(ActivityResultContracts.OpenDocumentTree()) { uri: Uri? ->
-        uri?.let { vm.update { copy(localPath = it.toString()) } }
+        uri?.let {
+            context.contentResolver.takePersistableUriPermission(
+                it,
+                Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION,
+            )
+            vm.update { copy(localPath = it.toString()) }
+        }
     }
 
     if (showRemoteBrowser && s.selectedAccountId != -1L) {

version.properties

@@ -1,2 +1,2 @@
-VERSION_NAME=1.0.1
-VERSION_CODE=2
+VERSION_NAME=1.0.2
+VERSION_CODE=3