feat: add config-driven AppX package removal tab

- Add config/appx.json with curated list of removable AppX packages

- Add AppX Removal tab (WPFTab6) with Select All, Clear, and Remove buttons

- Reuse existing Invoke-WPFUIElements engine for minimal code footprint

- Add Invoke-WPFAppxRemoval.ps1 for background runspace package removal

- Add theme colors for the new tab button in light and dark modes

scripts/main.ps1

@@ -86,6 +86,11 @@ $sync.configs.applications.PSObject.Properties | ForEach-Object {
     $sync.configs.applicationsHashtable[$_.Name] = $_.Value
 }
 
+$sync.configs.appxHashtable = @{}
+$sync.configs.appx.PSObject.Properties | ForEach-Object {
+    $sync.configs.appxHashtable[$_.Name] = $_.Value
+}
+
 Set-Preferences
 
 if ($Preset) {
@@ -188,6 +193,8 @@ Invoke-WPFUIElements -configVariable $sync.configs.tweaks -targetGridName "tweak
 
 Invoke-WPFUIElements -configVariable $sync.configs.feature -targetGridName "featurespanel" -columncount 2
 
+Invoke-WPFUIElements -configVariable $sync.configs.appx -targetGridName "appxpanel" -columncount 2
+
 # Future implementation: Add Windows Version to updates panel
 #Invoke-WPFUIElements -configVariable $sync.configs.updates -targetGridName "updatespanel" -columncount 1