Fix "Stop Gateway" button not killing gateway process, and misleading storage warning icon

flutter_app/android/app/src/main/kotlin/com/nxg/openclawproot/GatewayService.kt

@@ -274,21 +274,39 @@ class GatewayService : Service() {
     }
 
     private fun stopGateway() {
+        val procToStop: Process?
         synchronized(lock) {
             stopping = true
             restartCount = maxRestarts // Prevent auto-restart
             uptimeThread?.interrupt()
             uptimeThread = null
             watchdogThread?.interrupt()
             watchdogThread = null
-            gatewayProcess?.let {
-                try {
-                    it.destroyForcibly()
-                } catch (_: Exception) {}
-                gatewayProcess = null
-            }
+            // Interrupt the gateway thread in case it is sleeping during an
+            // auto-restart delay so it wakes up and sees stopping=true.
+            gatewayThread?.interrupt()
+            gatewayThread = null
+            procToStop = gatewayProcess
+            gatewayProcess = null
         }
         emitLog("Gateway stopped by user")
+        // Gracefully terminate proot via SIGTERM first, allowing its --kill-on-exit
+        // handler to kill child processes (node.js / openclaw daemon) before proot
+        // exits.  destroyForcibly() (SIGKILL) bypasses proot's exit handler, which
+        // can leave the gateway daemon alive even after proot is killed.
+        procToStop?.let { proc ->
+            Thread({
+                try {
+                    proc.destroy() // SIGTERM — lets proot clean up its children
+                    if (!proc.waitFor(3, java.util.concurrent.TimeUnit.SECONDS)) {
+                        // proot did not exit cleanly; force-kill it.
+                        proc.destroyForcibly()
+                    }
+                } catch (_: Exception) {
+                    try { proc.destroyForcibly() } catch (_: Exception) {}
+                }
+            }, "gateway-stop").apply { isDaemon = true }.start()
+        }
     }
 
     /** Watchdog: periodically checks if the proot process is alive.

flutter_app/lib/screens/settings_screen.dart

@@ -120,11 +120,11 @@ class _SettingsScreenState extends State<SettingsScreen> {
                   title: const Text('Setup Storage'),
                   subtitle: Text(_storageGranted
                       ? 'Granted — proot can access /sdcard. Revoke if not needed.'
-                      : 'Allow access to shared storage'),
+                      : 'Not granted (recommended) — tap to grant only if needed'),
                   leading: const Icon(Icons.sd_storage),
                   trailing: _storageGranted
                       ? const Icon(Icons.warning_amber, color: AppColors.statusAmber)
-                      : const Icon(Icons.warning, color: AppColors.statusAmber),
+                      : const Icon(Icons.check_circle, color: AppColors.statusGreen),
                   onTap: () async {
                     await NativeBridge.requestStoragePermission();
                     // Refresh after returning from permission screen