fix: SMTP default port 465 + corrupt port recovery + click feedback on save buttons

- default SMTP port 587 -> 465 (SMTPS implicit TLS)
- init-collector: auto-correct port < 25 to 465 (previous bug stored 3)
- save-email fallback 587 -> 465
- email / SMS-number / SMS-quota save buttons show "✓ 已保存" for 2s

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/src/main/java/com/a2i/forwarder/store/SettingsStore.kt

@@ -92,7 +92,7 @@ class SettingsStore(
     // 电邮转发
     val emailForwardingEnabled = MutableStateFlow(false)
     val smtpHost = MutableStateFlow("")
-    val smtpPort = MutableStateFlow(587)
+    val smtpPort = MutableStateFlow(465)
     val smtpUser = MutableStateFlow("")
     val smtpPassword = MutableStateFlow("")
     val smtpFrom = MutableStateFlow("")
@@ -129,7 +129,7 @@ class SettingsStore(
                 // 电邮转发
                 emailForwardingEnabled.value = p[K.EMAIL_ENABLED] ?: false
                 smtpHost.value = p[K.EMAIL_HOST] ?: ""
-                smtpPort.value = p[K.EMAIL_PORT] ?: 587
+                smtpPort.value = p[K.EMAIL_PORT]?.let { if (it < 25) 465 else it } ?: 465
                 smtpUser.value = p[K.EMAIL_USER] ?: ""
                 smtpPassword.value = p[K.EMAIL_PASS] ?: ""
                 smtpFrom.value = p[K.EMAIL_FROM] ?: ""

app/src/main/java/com/a2i/forwarder/ui/screens/SettingsScreen.kt

@@ -45,6 +45,7 @@ import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextButton
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
@@ -114,6 +115,9 @@ fun SettingsScreen(onOpenLog: () -> Unit) {
     var smtpPasswordInput by remember(smtpPassword) { mutableStateOf(smtpPassword) }
     var smtpFromInput by remember(smtpFrom) { mutableStateOf(smtpFrom) }
     var emailToInput by remember(emailTo) { mutableStateOf(emailTo) }
+    var emailSaved by remember { mutableStateOf(false) }
+    var smsNumSaved by remember { mutableStateOf(false) }
+    var smsQuotaSaved by remember { mutableStateOf(false) }
 
     val smsPermLauncher = rememberLauncherForActivityResult(ActivityResultContracts.RequestPermission()) { }
     val hasSmsPerm = remember {
@@ -228,15 +232,22 @@ fun SettingsScreen(onOpenLog: () -> Unit) {
                         onClick = {
                             app.appScope.launch {
                                 app.settings.setSmtpHost(smtpHostInput.trim())
-                                app.settings.setSmtpPort(smtpPortInput.trim().toIntOrNull() ?: 587)
+                                app.settings.setSmtpPort(smtpPortInput.trim().toIntOrNull() ?: 465)
                                 app.settings.setSmtpUser(smtpUserInput.trim())
                                 app.settings.setSmtpPassword(smtpPasswordInput.trim())
                                 app.settings.setSmtpFrom(smtpFromInput.trim())
                                 app.settings.setEmailTo(emailToInput.trim())
                             }
+                            emailSaved = true
                         },
                         modifier = Modifier.fillMaxWidth(),
-                    ) { Text("保存电邮设置") }
+                    ) { Text(if (emailSaved) "✓ 已保存" else "保存电邮设置") }
+                    if (emailSaved) {
+                        LaunchedEffect(Unit) {
+                            kotlinx.coroutines.delay(2000)
+                            emailSaved = false
+                        }
+                    }
                 }
             }
         }
@@ -262,7 +273,11 @@ fun SettingsScreen(onOpenLog: () -> Unit) {
                 Row(Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.spacedBy(8.dp)) {
                     OutlinedButton(onClick = {
                         app.appScope.launch { app.settings.setSmsTargetNumber(smsTargetInput.trim()) }
-                    }, modifier = Modifier.weight(1f)) { Text("保存号码") }
+                        smsNumSaved = true
+                    }, modifier = Modifier.weight(1f)) { Text(if (smsNumSaved) "✓ 已保存" else "保存号码") }
+                    if (smsNumSaved) {
+                        LaunchedEffect(Unit) { kotlinx.coroutines.delay(2000); smsNumSaved = false }
+                    }
                     if (!hasSmsPerm) {
                         OutlinedButton(onClick = {
                             smsPermLauncher.launch(android.Manifest.permission.SEND_SMS)
@@ -294,7 +309,11 @@ fun SettingsScreen(onOpenLog: () -> Unit) {
                         app.settings.setSmsBalance(q)
                         if (q > 5) app.settings.setSmsSuspended(false)
                     }
-                }) { Text("保存额度并解除挂起") }
+                    smsQuotaSaved = true
+                }) { Text(if (smsQuotaSaved) "✓ 已保存" else "保存额度并解除挂起") }
+                if (smsQuotaSaved) {
+                    LaunchedEffect(Unit) { kotlinx.coroutines.delay(2000); smsQuotaSaved = false }
+                }
 
                 Spacer(Modifier.size(8.dp))
                 val balanceText = when {