Refactor: Cleanup app removal, remove legacy app list generator and CustomAppsList file support (#662)

* remove support for uninstalling old sunset apps

* Add color legend on app removal screen

* Remove legacy app list generator and custom apps file support
Replaced by GUI config export/import, dynamic RemovalMethod, and
CLI app removal settings saved to LastUsedSettings.json.

* Verify app removal by checking actual installation state instead of trusting winget output

Scripts/AppRemoval/Test-AppInWingetList.ps1

@@ -0,0 +1,43 @@
+<#
+    .SYNOPSIS
+    Checks whether an app ID appears in a parsed winget installed list.
+
+    .DESCRIPTION
+    Tries an exact match against the .Id property first. When that
+    fails, falls back to a substring search guarded by a word-boundary
+    regex so that short IDs don't accidentally match longer ones
+    (e.g. 'Microsoft.Edge' will not match 'Microsoft.EdgeDev').
+
+    .PARAMETER appId
+    The identifier to search for (e.g. 'Microsoft.Copilot').
+
+    .PARAMETER InstalledList
+    An array of PSCustomObject from GetInstalledAppsViaWinget.
+#>
+function Test-AppInWingetList {
+    param(
+        [string]$appId,
+        [object[]]$InstalledList
+    )
+
+    if (-not $InstalledList) { return $false }
+
+    # Normalize to array
+    $list = @($InstalledList)
+
+    # Exact match first (fast and precise)
+    if ($list.Id -contains $appId) {
+        return $true
+    }
+
+    # Substring fallback with word-boundary guard
+    $boundaryPattern = '(?<![a-zA-Z0-9])' + [regex]::Escape($appId) + '(?![a-zA-Z0-9])'
+
+    foreach ($entry in $list) {
+        if ($entry.Id -like "*$appId*" -and $entry.Id -match $boundaryPattern) {
+            return $true
+        }
+    }
+
+    return $false
+}