feat: Implement multi-select and editing for BYO apps

Introduces multi-selection capabilities to the "Bring Your Own" applications list, allowing users to select and remove multiple applications at once.

This change also adds the ability to edit an existing application's details directly from the UI. The application list view is now dynamically generated to support these new features, including selectable rows.

Key changes:
- Adds "Edit Application" and "Remove Selected" buttons.
- Enables/disables action buttons based on the number of selected items.
- Modifies the "Add Application" form to function as an "Update" form when editing.
- Implements selection via mouse click, checkboxes, and the spacebar.

FFUDevelopment/FFUUI.Core/FFUUI.Core.Handlers.psm1

@@ -356,6 +356,13 @@ function Register-EventHandlers {
             Add-BYOApplication -State $localState
         })
 
+    $State.Controls.btnEditApplication.Add_Click({
+            param($eventSource, $routedEventArgs)
+            $window = [System.Windows.Window]::GetWindow($eventSource)
+            $localState = $window.Tag
+            Start-EditBYOApplication -State $localState
+        })
+
     $State.Controls.btnSaveBYOApplications.Add_Click({
             param($eventSource, $routedEventArgs)
             $window = [System.Windows.Window]::GetWindow($eventSource)
@@ -398,12 +405,21 @@ function Register-EventHandlers {
             $window = [System.Windows.Window]::GetWindow($eventSource)
             $localState = $window.Tag
 
+            # Before clearing, check if we are in edit mode and reset the state
+            if ($null -ne $localState.Data.editingBYOApplication) {
+                $localState.Data.editingBYOApplication = $null
+                $localState.Controls.btnAddApplication.Content = "Add Application"
+            }
+
             Clear-ListViewContent -State $localState `
                 -ListViewControl $localState.Controls.lstApplications `
                 -ConfirmationTitle "Clear BYO Applications" `
                 -ConfirmationMessage "Are you sure you want to clear all 'Bring Your Own' applications?" `
                 -StatusMessage "BYO application list cleared." `
-                -PostClearAction { Update-CopyButtonState -State $State }
+                -PostClearAction { 
+                Update-CopyButtonState -State $State
+                Update-BYOAppsActionButtonsState -State $State 
+            }
         })
             
     $State.Controls.btnCopyBYOApps.Add_Click({
@@ -413,6 +429,13 @@ function Register-EventHandlers {
             Invoke-CopyBYOApps -State $localState -Button $eventSource
         })
 
+    $State.Controls.btnRemoveSelectedBYOApps.Add_Click({
+            param($eventSource, $routedEventArgs)
+            $window = [System.Windows.Window]::GetWindow($eventSource)
+            $localState = $window.Tag
+            Remove-SelectedBYOApplications -State $localState
+        })
+
     $State.Controls.btnMoveTop.Add_Click({
             param($eventSource, $routedEventArgs)
             $window = [System.Windows.Window]::GetWindow($eventSource)
@@ -441,6 +464,65 @@ function Register-EventHandlers {
             Move-ListViewItemBottom -ListView $localState.Controls.lstApplications
         })
 
+    $State.Controls.lstApplications.Add_PreviewKeyDown({
+            param($eventSource, $keyEvent)
+            if ($keyEvent.Key -eq 'Space') {
+                $window = [System.Windows.Window]::GetWindow($eventSource)
+                $localState = $window.Tag
+                Invoke-ListViewItemToggle -ListView $eventSource -State $localState -HeaderCheckBoxKeyName 'chkSelectAllBYOApps'
+                # Update button states after toggle
+                Update-BYOAppsActionButtonsState -State $localState
+                $keyEvent.Handled = $true
+            }
+        })
+
+    $State.Controls.lstApplications.Add_SelectionChanged({
+            param($eventSource, $selChangeEvent)
+            $window = [System.Windows.Window]::GetWindow($eventSource)
+            $localState = $window.Tag
+            $headerChk = $localState.Controls.chkSelectAllBYOApps
+            if ($null -ne $headerChk) {
+                Update-SelectAllHeaderCheckBoxState -ListView $localState.Controls.lstApplications -HeaderCheckBox $headerChk
+            }
+            # Update button states based on selection
+            Update-BYOAppsActionButtonsState -State $localState
+        })
+
+    # Add a routed event handler to catch checkbox clicks within the ListView
+    $State.Controls.lstApplications.AddHandler(
+        [System.Windows.Controls.Primitives.ButtonBase]::ClickEvent,
+        [System.Windows.RoutedEventHandler] {
+            param($eventSource, $e)
+            # Check if the original source of the click was a CheckBox
+            $clickedCheckBox = $e.OriginalSource
+            if ($clickedCheckBox -is [System.Windows.Controls.CheckBox]) {
+                $window = [System.Windows.Window]::GetWindow($eventSource)
+                $localState = $window.Tag
+                $dataItem = $clickedCheckBox.DataContext
+
+                if ($null -ne $dataItem) {
+                    # Defensively add the 'IsSelected' property if it's missing from the data object.
+                    # This can happen in some complex UI scenarios or if the object was created without it.
+                    if ($null -eq $dataItem.PSObject.Properties['IsSelected']) {
+                        $dataItem | Add-Member -MemberType NoteProperty -Name 'IsSelected' -Value $false
+                    }
+                    
+                    # Now that we're sure the property exists, set its value.
+                    $dataItem.IsSelected = $clickedCheckBox.IsChecked
+                }
+
+                # Update the state of the action buttons based on the new selection.
+                Update-BYOAppsActionButtonsState -State $localState
+
+                # Also, update the header checkbox to reflect the change.
+                $headerChk = $localState.Controls.chkSelectAllBYOApps
+                if ($null -ne $headerChk) {
+                    Update-SelectAllHeaderCheckBoxState -ListView $localState.Controls.lstApplications -HeaderCheckBox $headerChk
+                }
+            }
+        }
+    )
+
     # Apps Script Variables Event Handlers
     # Attach the handler to the script variables checkbox
     $State.Controls.chkDefineAppsScriptVariables.Add_Checked($appPanelUpdateHandler)