Refactor: Decouple BYO Apps UI logic into core modules

Moves the event handling and business logic for the "Bring Your Own Applications" feature from the main UI script into dedicated core modules.

This change improves code organization and separation of concerns by centralizing application-related functions and their corresponding event handlers. The main UI script is now cleaner and primarily responsible for UI initialization, enhancing overall code maintainability.

FFUDevelopment/FFUUI.Core/FFUUI.Core.Applications.psm1

@@ -28,7 +28,6 @@ function Remove-Application {
     )
 
     $listView = $State.Controls.lstApplications
-
     # Remove the item with the specified priority
     $itemToRemove = $listView.Items | Where-Object { $_.Priority -eq $priority } | Select-Object -First 1
     if ($itemToRemove) {
@@ -40,6 +39,37 @@ function Remove-Application {
     }
 }
 
+# Function to add a new BYO application from the UI
+function Add-BYOApplication {
+    [CmdletBinding()]
+    param(
+        [Parameter(Mandatory)]
+        [psobject]$State
+    )
+
+    $name = $State.Controls.txtAppName.Text
+    $commandLine = $State.Controls.txtAppCommandLine.Text
+    $arguments = $State.Controls.txtAppArguments.Text
+    $source = $State.Controls.txtAppSource.Text
+
+    if ([string]::IsNullOrWhiteSpace($name) -or [string]::IsNullOrWhiteSpace($commandLine) -or [string]::IsNullOrWhiteSpace($arguments)) {
+        [System.Windows.MessageBox]::Show("Please fill in all fields (Name, Command Line, and Arguments)", "Missing Information", [System.Windows.MessageBoxButton]::OK, [System.Windows.MessageBoxImage]::Warning)
+        return
+    }
+    $listView = $State.Controls.lstApplications
+    $priority = 1
+    if ($listView.Items.Count -gt 0) {
+        $priority = ($listView.Items | Measure-Object -Property Priority -Maximum).Maximum + 1
+    }
+    $application = [PSCustomObject]@{ Priority = $priority; Name = $name; CommandLine = $commandLine; Arguments = $arguments; Source = $source; CopyStatus = "" }
+    $listView.Items.Add($application)
+    $State.Controls.txtAppName.Text = ""
+    $State.Controls.txtAppCommandLine.Text = ""
+    $State.Controls.txtAppArguments.Text = ""
+    $State.Controls.txtAppSource.Text = ""
+    Update-CopyButtonState -State $State
+}
+
 # Function to save BYO applications to JSON
 function Save-BYOApplicationList {
     [CmdletBinding()]
@@ -114,7 +144,54 @@ function Import-BYOApplicationList {
         [System.Windows.MessageBox]::Show("Failed to import applications: $_", "Error", [System.Windows.MessageBoxButton]::OK, [System.Windows.MessageBoxImage]::Error)
     }
 }
-
+        
+# Function to invoke the parallel copy process for BYO apps
+function Invoke-CopyBYOApps {
+    param(
+        [psobject]$State,
+        [System.Windows.Controls.Button]$Button
+    )
+        
+    $appsToCopy = $State.Controls.lstApplications.Items | Where-Object { -not [string]::IsNullOrWhiteSpace($_.Source) }
+    if (-not $appsToCopy) {
+        [System.Windows.MessageBox]::Show("No applications with a source path specified.", "Copy BYO Apps", "OK", "Information")
+        return
+    }
+        
+    $Button.IsEnabled = $false
+    $State.Controls.pbOverallProgress.Visibility = 'Visible'
+    $State.Controls.pbOverallProgress.Value = 0
+    $State.Controls.txtStatus.Text = "Starting BYO app copy..."
+        
+    # Define necessary task-specific variables locally
+    $localAppsPath = $State.Controls.txtApplicationPath.Text
+        
+    # Create hashtable for task-specific arguments
+    $taskArguments = @{
+        AppsPath = $localAppsPath
+    }
+        
+    # Select only necessary properties before passing
+    $itemsToProcess = $appsToCopy | Select-Object Priority, Name, CommandLine, Arguments, Source
+        
+    # Invoke the centralized parallel processing function
+    # Pass task type and task-specific arguments
+    Invoke-ParallelProcessing -ItemsToProcess $itemsToProcess `
+        -ListViewControl $State.Controls.lstApplications `
+        -IdentifierProperty 'Name' `
+        -StatusProperty 'CopyStatus' `
+        -TaskType 'CopyBYO' `
+        -TaskArguments $taskArguments `
+        -CompletedStatusText "Copied" `
+        -ErrorStatusPrefix "Error: " `
+        -WindowObject $State.Window `
+        -MainThreadLogPath $State.LogFilePath
+        
+    # Final status update (handled by Invoke-ParallelProcessing)
+    $State.Controls.pbOverallProgress.Visibility = 'Collapsed'
+    $Button.IsEnabled = $true
+}
+        
 # Function to copy a single BYO application (Modified for ForEach-Object -Parallel)
 function Start-CopyBYOApplicationTask {
     [CmdletBinding()]