feat(android): show resolver diagnostics

android/app/src/main/java/com/masterdns/vpn/ui/home/HomeScreen.kt

@@ -78,6 +78,9 @@ fun HomeScreen(
     val socksAuthEnabled = advanced["SOCKS5_AUTH"].equals("true", ignoreCase = true)
     val socksUser = advanced["SOCKS5_USER"]?.trim().orEmpty()
     val socksPass = advanced["SOCKS5_PASS"]?.trim().orEmpty()
+    val configuredResolverCount = remember(selectedProfile?.resolvers) {
+        countConfiguredResolvers(selectedProfile?.resolvers.orEmpty())
+    }
 
     val vpnPermissionLauncher = rememberLauncherForActivityResult(
         ActivityResultContracts.StartActivityForResult()
@@ -223,6 +226,7 @@ fun HomeScreen(
                         MdvConnectionTelemetryCard(
                             vpnState = vpnState,
                             scanStatus = scanStatus,
+                            configuredResolverCount = configuredResolverCount,
                             scannedCount = scannedCount,
                             totalResolvers = totalResolvers,
                             scanProgress = scanProgress,
@@ -292,6 +296,7 @@ fun HomeScreen(
                 MdvConnectionTelemetryCard(
                     vpnState = vpnState,
                     scanStatus = scanStatus,
+                    configuredResolverCount = configuredResolverCount,
                     scannedCount = scannedCount,
                     totalResolvers = totalResolvers,
                     scanProgress = scanProgress,
@@ -321,6 +326,13 @@ fun HomeScreen(
     }
 }
 
+private fun countConfiguredResolvers(resolvers: String): Int {
+    return resolvers
+        .lineSequence()
+        .map { it.substringBefore("#").trim() }
+        .count { it.isNotEmpty() }
+}
+
 private fun parseAdvanced(json: String): Map<String, String> {
     return try {
         val type = object : TypeToken<Map<String, String>>() {}.type

android/app/src/main/java/com/masterdns/vpn/ui/home/HomeStatusCards.kt

@@ -32,6 +32,7 @@ import com.masterdns.vpn.util.VpnManager
 fun MdvConnectionTelemetryCard(
     vpnState: VpnManager.VpnState,
     scanStatus: VpnManager.ScanStatus,
+    configuredResolverCount: Int,
     scannedCount: Int,
     totalResolvers: Int,
     scanProgress: Float,
@@ -129,6 +130,15 @@ fun MdvConnectionTelemetryCard(
                     color = MdvColor.OnSurface
                 )
             }
+            ResolverTroubleshootingBlock(
+                configuredResolverCount = configuredResolverCount,
+                coreTotalResolvers = totalResolvers,
+                scannedCount = scannedCount,
+                validCount = scanStatus.validCount,
+                rejectedCount = scanStatus.rejectedCount,
+                isConnecting = isConnecting,
+                isError = vpnState == VpnManager.VpnState.ERROR
+            )
             androidx.compose.foundation.layout.Spacer(modifier = Modifier.height(MdvSpace.S1))
             Text(
                 text = stringResource(R.string.home_speed_row, formatSpeed(downBps), formatSpeed(upBps)),
@@ -167,6 +177,58 @@ fun MdvConnectionTelemetryCard(
     }
 }
 
+@Composable
+private fun ResolverTroubleshootingBlock(
+    configuredResolverCount: Int,
+    coreTotalResolvers: Int,
+    scannedCount: Int,
+    validCount: Int,
+    rejectedCount: Int,
+    isConnecting: Boolean,
+    isError: Boolean
+) {
+    val shouldShow = configuredResolverCount > 0 ||
+        coreTotalResolvers > 0 ||
+        scannedCount > 0 ||
+        isConnecting ||
+        isError
+    if (!shouldShow) return
+
+    androidx.compose.foundation.layout.Spacer(modifier = Modifier.height(MdvSpace.S2))
+    Text(
+        text = stringResource(R.string.home_resolver_diagnostics_title),
+        style = MaterialTheme.typography.bodySmall.copy(fontWeight = FontWeight.SemiBold),
+        color = MdvColor.OnSurface
+    )
+    androidx.compose.foundation.layout.Spacer(modifier = Modifier.height(2.dp))
+    Text(
+        text = stringResource(
+            R.string.home_resolver_diagnostics_counts,
+            configuredResolverCount,
+            coreTotalResolvers
+        ),
+        style = MaterialTheme.typography.bodySmall,
+        color = MdvColor.OnSurfaceVariant
+    )
+
+    val warningText = when {
+        configuredResolverCount == 0 -> stringResource(R.string.home_resolver_no_configured_warning)
+        isConnecting && coreTotalResolvers == 0 -> stringResource(R.string.home_resolver_waiting_core_scan)
+        scannedCount > 0 && validCount == 0 && rejectedCount > 0 ->
+            stringResource(R.string.home_resolver_all_rejected_warning)
+        else -> null
+    }
+
+    warningText?.let {
+        androidx.compose.foundation.layout.Spacer(modifier = Modifier.height(2.dp))
+        Text(
+            text = it,
+            style = MaterialTheme.typography.bodySmall,
+            color = if (validCount == 0 && rejectedCount > 0) DisconnectedRed else MdvColor.OnSurfaceVariant
+        )
+    }
+}
+
 @Composable
 fun MdvProfileSelectorCard(
     profileName: String,

android/app/src/main/res/values/strings.xml

@@ -65,6 +65,11 @@
     <string name="home_dns_scan_progress">DNS Scan Progress: %1$d / %2$d</string>
     <string name="home_synced_mtu">Synced MTU: UP %1$d / DOWN %2$d</string>
     <string name="home_active_resolvers">Active Resolvers: %1$d</string>
+    <string name="home_resolver_diagnostics_title">Resolver diagnostics</string>
+    <string name="home_resolver_diagnostics_counts">Configured lines: %1$d   Core scan total: %2$d</string>
+    <string name="home_resolver_no_configured_warning">No inline resolvers are configured for this profile.</string>
+    <string name="home_resolver_waiting_core_scan">Waiting for core resolver scan totals from runtime logs.</string>
+    <string name="home_resolver_all_rejected_warning">No accepted resolver yet. Check resolver format, network reachability, and profile settings.</string>
     <string name="home_speed_row">Download: %1$s   Upload: %2$s</string>
     <string name="home_socks_address">SOCKS5: %1$s:%2$d</string>
     <string name="home_socks_auth_title">SOCKS5 authentication</string>