Fixed toggle switch not working issue. (#41049)

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fix/what does it change/how was it tested (even manually, if necessary)?
-->
## Summary of the Pull Request
Fixed toggle switch not working issue.

## AI Summary
This pull request refactors how `DashboardListItem` objects are created
and added to collections in the `DashboardViewModel`. The main
improvement is to separate the instantiation of each `DashboardListItem`
from the assignment of its `EnabledChangedCallback` property, which is
now set after the object is added to the relevant collection. This
change improves clarity and may help prevent issues related to object
initialization order.

Refactoring of `DashboardListItem` creation and initialization:

* In the `AddDashboardListItem` method, the `DashboardListItem` object
is now created and added to `AllModules` before its
`EnabledChangedCallback` property is set, instead of setting this
property during object initialization.
* In the `GetShortcutModules` method, both `ShortcutModules` and
`ActionModules` collections now receive `DashboardListItem` objects that
are instantiated first, added to the collection, and then have their
`EnabledChangedCallback` property set. This replaces the previous
pattern of setting the callback during object creation.
[[1]](diffhunk://#diff-aea3404667e7a3de2750bf9ab7ee8ff5e717892caa68ee1de86713cf8e21b44cL123-R136)
[[2]](diffhunk://#diff-aea3404667e7a3de2750bf9ab7ee8ff5e717892caa68ee1de86713cf8e21b44cL144-R159)
* 
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## PR Checklist

- [x] Closes: #41046
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

<!-- Provide a more detailed description of the PR, other things fixed,
or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments
It is an regression from
https://github.com/microsoft/PowerToys/pull/40214

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wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

---------

Signed-off-by: Shuai Yuan <shuai.yuan.zju@gmail.com>

src/settings-ui/Settings.UI/ViewModels/DashboardViewModel.cs

@@ -69,16 +69,18 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
         private void AddDashboardListItem(ModuleType moduleType)
         {
             GpoRuleConfigured gpo = ModuleHelper.GetModuleGpoConfiguration(moduleType);
-            AllModules.Add(new DashboardListItem()
+            var newItem = new DashboardListItem()
             {
                 Tag = moduleType,
                 Label = resourceLoader.GetString(ModuleHelper.GetModuleLabelResourceName(moduleType)),
                 IsEnabled = gpo == GpoRuleConfigured.Enabled || (gpo != GpoRuleConfigured.Disabled && ModuleHelper.GetIsModuleEnabled(generalSettingsConfig, moduleType)),
                 IsLocked = gpo == GpoRuleConfigured.Enabled || gpo == GpoRuleConfigured.Disabled,
                 Icon = ModuleHelper.GetModuleTypeFluentIconName(moduleType),
-                EnabledChangedCallback = EnabledChangedOnUI,
                 DashboardModuleItems = GetModuleItems(moduleType),
-            });
+            };
+
+            AllModules.Add(newItem);
+            newItem.EnabledChangedCallback = EnabledChangedOnUI;
         }
 
         private void EnabledChangedOnUI(DashboardListItem dashboardListItem)
@@ -120,16 +122,18 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
 
                 if (filteredItems.Count != 0)
                 {
-                    ShortcutModules.Add(new DashboardListItem
+                    var newItem = new DashboardListItem
                     {
-                        EnabledChangedCallback = x.EnabledChangedCallback,
                         Icon = x.Icon,
                         IsLocked = x.IsLocked,
                         Label = x.Label,
                         Tag = x.Tag,
                         IsEnabled = x.IsEnabled,
                         DashboardModuleItems = new ObservableCollection<DashboardModuleItem>(filteredItems),
-                    });
+                    };
+
+                    ShortcutModules.Add(newItem);
+                    newItem.EnabledChangedCallback = x.EnabledChangedCallback;
                 }
             }
 
@@ -141,16 +145,18 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
 
                 if (filteredItems.Count != 0)
                 {
-                    ActionModules.Add(new DashboardListItem
+                    var newItem = new DashboardListItem
                     {
-                        EnabledChangedCallback = x.EnabledChangedCallback,
                         Icon = x.Icon,
                         IsLocked = x.IsLocked,
                         Label = x.Label,
                         Tag = x.Tag,
                         IsEnabled = x.IsEnabled,
                         DashboardModuleItems = new ObservableCollection<DashboardModuleItem>(filteredItems),
-                    });
+                    };
+
+                    ActionModules.Add(newItem);
+                    newItem.EnabledChangedCallback = x.EnabledChangedCallback;
                 }
             }
         }