[FE] Disable AC Control Button When AC is Off SP-1387 (#283)

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## Jira Ticket
[SP-1387](https://syncrow.atlassian.net/browse/SP-1387)

## Description

<!--- Describe your changes in detail -->

## Type of Change

<!--- Put an `x` in all the boxes that apply: -->

- [ ] ✨ New feature (non-breaking change which adds functionality)
- [x] 🛠️ Bug fix (non-breaking change which fixes an issue)
- [ ] ❌ Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] 🧹 Code refactor
- [ ] ✅ Build configuration change
- [ ] 📝 Documentation
- [ ] 🗑️ Chore 


[SP-1387]:
https://syncrow.atlassian.net/browse/SP-1387?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

lib/pages/device_managment/all_devices/widgets/device_managment_body.dart

@@ -62,7 +62,8 @@ class DeviceManagementBody extends StatelessWidget with HelperResponsiveLayout {
 
         final buttonLabel =
             (selectedDevices.length > 1) ? 'Batch Control' : 'Control';
-
+        final isAnyDeviceOffline =
+            selectedDevices.any((element) => !(element.online ?? false));
         return Row(
           children: [
             Expanded(child: SpaceTreeView(
@@ -103,8 +104,26 @@ class DeviceManagementBody extends StatelessWidget with HelperResponsiveLayout {
                                 decoration: containerDecoration,
                                 child: Center(
                                   child: DefaultButton(
+                                    backgroundColor: isAnyDeviceOffline
+                                        ? ColorsManager.primaryColor
+                                            .withValues(alpha: 0.1)
+                                        : null,
                                     onPressed: isControlButtonEnabled
                                         ? () {
+                                            if (isAnyDeviceOffline) {
+                                              ScaffoldMessenger.of(context)
+                                                  .showSnackBar(
+                                                const SnackBar(
+                                                  content: Text(
+                                                    'This Device is Offline',
+                                                  ),
+                                                  duration:
+                                                      Duration(seconds: 2),
+                                                ),
+                                              );
+                                              return;
+                                            }
+
                                             if (selectedDevices.length == 1) {
                                               showDialog(
                                                 context: context,