updated redirect hint and fix anr for redirect port

app/src/main/java/sh/sar/textpipe/service/TextpipeService.kt

@@ -20,8 +20,8 @@ import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.cancel
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
-import kotlinx.coroutines.runBlocking
 import sh.sar.textpipe.MainActivity
 import sh.sar.textpipe.TextpipeApplication
 import sh.sar.textpipe.data.repository.SmsRepository
@@ -124,7 +124,7 @@ class TextpipeService : Service() {
         val port = getConfiguredPort(this)
         _serverPort.value = port
 
-        serviceScope.launch {
+        serviceScope.launch(Dispatchers.IO) {
             // Setup port redirect if configured
             redirectPort = getRedirectPort(this@TextpipeService)
             if (redirectPort > 0 && redirectPort != port) {
@@ -164,10 +164,11 @@ class TextpipeService : Service() {
     override fun onDestroy() {
         Log.i(TAG, "Service onDestroy")
 
-        // Clear port redirect synchronously before stopping
+        // Clear port redirect asynchronously (fire and forget to avoid ANR)
         if (redirectPort > 0) {
-            runBlocking {
-                RootManager.clearPortRedirect(redirectPort, textpipeServer?.getPort() ?: 8080)
+            val port = textpipeServer?.getPort() ?: 8080
+            GlobalScope.launch(Dispatchers.IO) {
+                RootManager.clearPortRedirect(redirectPort, port)
             }
         }
 

app/src/main/java/sh/sar/textpipe/ui/MainScreen.kt

@@ -256,7 +256,7 @@ private fun PortConfigCard(
                 )
 
                 Text(
-                    text = "Traffic on redirect port will be forwarded to server port via iptables",
+                    text = "Ports below 1024 (like 80, 443) require root. Uses iptables to redirect traffic to server port.",
                     style = MaterialTheme.typography.bodySmall,
                     color = MaterialTheme.colorScheme.onSurfaceVariant,
                     modifier = Modifier.padding(top = 4.dp)