Ensure dirs + resolv.conf exist before every proot operation (#40)

getProotShellConfig() is called by all screens before starting proot
(terminal, configure, onboarding, package install). Adding setupDirs
and writeResolv here guarantees resolv.conf exists regardless of which
screen the user opens first after an app update.

Co-Authored-By: Mithun Gowda B <mithungowda.b7411@gmail.com>

Author: mithun50

flutter_app/lib/services/terminal_service.dart

@@ -14,7 +14,15 @@ class TerminalService {
   /// Get paths and host-side proot environment variables.
   /// Host env should ONLY contain proot-specific vars — guest env is
   /// set via `env -i` inside the command, matching proot-distro.
+  ///
+  /// Also ensures directories and resolv.conf exist — Android may clear
+  /// them during an app update (#40). Every screen that uses proot calls
+  /// this method, so it's the single place to guarantee the files exist.
   static Future<Map<String, String>> getProotShellConfig() async {
+    // Ensure dirs + resolv.conf exist before any proot operation (#40).
+    try { await NativeBridge.setupDirs(); } catch (_) {}
+    try { await NativeBridge.writeResolv(); } catch (_) {}
+
     final filesDir = await _channel.invokeMethod<String>('getFilesDir') ?? '';
     final nativeLibDir = await _channel.invokeMethod<String>('getNativeLibDir') ?? '';