Show per-app proxy help in a dialog (#6192)

Replace the short-lived info toast with the existing titleless confirmation dialog and a single OK button so users can read the routing explanation at their own pace. Keep dialog visibility in saveable screen state and reuse the existing localized help and action strings.

Extract only the help-dialog presentation from local/talkback-all-10; leave app-row semantics, switches, routing descriptions, and notification infrastructure in the accessibility branches.

V2rayNG/app/src/main/java/com/v2ray/ang/ui/perappproxy/PerAppProxyActivity.kt

@@ -41,13 +41,13 @@ import androidx.compose.ui.unit.dp
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.v2ray.ang.R
 import com.v2ray.ang.dto.AppInfo
-import com.v2ray.ang.extension.toastInfo
 import com.v2ray.ang.extension.toastSuccess
 import com.v2ray.ang.ui.base.BaseComponentActivity
 import com.v2ray.ang.ui.compose.AppDivider
 import com.v2ray.ang.ui.compose.AppDropdownMenuItems
 import com.v2ray.ang.ui.compose.AppListItem
 import com.v2ray.ang.ui.compose.AppTopBar
+import com.v2ray.ang.ui.compose.ConfirmDialog
 import com.v2ray.ang.ui.compose.ItemDivider
 import com.v2ray.ang.ui.compose.NavigationBarsBottomPadding
 import com.v2ray.ang.ui.compose.verticalScrollbar
@@ -87,9 +87,6 @@ class PerAppProxyActivity : BaseComponentActivity() {
             onBackClick = { finish() },
             onPerAppProxyChanged = { viewModel.setPerAppProxyEnabled(it) },
             onBypassAppsChanged = { viewModel.setBypassAppsEnabled(it) },
-            onInfoClick = {
-                toastInfo(R.string.summary_pref_per_app_proxy)
-            },
             onToggleApp = { viewModel.toggle(it) },
             onSearch = { viewModel.filterApps(it) },
             onSelectAll = { viewModel.selectAll() },
@@ -118,7 +115,6 @@ fun PerAppProxyScreen(
     onBackClick: () -> Unit,
     onPerAppProxyChanged: (Boolean) -> Unit,
     onBypassAppsChanged: (Boolean) -> Unit,
-    onInfoClick: () -> Unit,
     onToggleApp: (String) -> Unit,
     onSearch: (String) -> Unit,
     onSelectAll: () -> Unit,
@@ -130,6 +126,8 @@ fun PerAppProxyScreen(
     var showSearch by rememberSaveable { mutableStateOf(false) }
     var searchQuery by rememberSaveable { mutableStateOf("") }
     var showMenu by remember { mutableStateOf(false) }
+    var showInfoDialog by rememberSaveable { mutableStateOf(false) }
+    val onInfoClick = { showInfoDialog = true }
     val listState = rememberLazyListState()
 
     LaunchedEffect(Unit) {
@@ -281,4 +279,13 @@ fun PerAppProxyScreen(
             }
         }
     }
+
+    if (showInfoDialog) {
+        ConfirmDialog(
+            message = stringResource(R.string.summary_pref_per_app_proxy),
+            dismissText = null,
+            onConfirm = {},
+            onDismiss = { showInfoDialog = false },
+        )
+    }
 }