Rework foss filtering (#4696)

* Replace FOSS highlight toggle with inline label

Remove the separate "Highlight FOSS" toggle and its theming logic, and instead append an inline "- FOSS" label to FOSS app entries. Changes: remove WPFToggleFOSSHighlight from app navigation and related event handlers, delete FOSSColor resource updates in theme code and button handler, simplify checkbox setup in Invoke-WPFUIElements by removing the special-case toggle logic, and update Initialize-InstallAppEntry to build a horizontal panel containing the app name plus a small green "- FOSS" TextBlock for FOSS items. This consolidates FOSS indication into the item UI and cleans up toggle/theme handling.

* Add inline FOSS label to app entries

Replace the separate StackPanel/TextBlock used for the FOSS indicator with an inline System.Windows.Documents.Run appended to the app name. The run is styled (green RGB(76,175,80) and FontSize=10) and the checkbox content assignment was moved outside the conditional so the appName (with optional FOSS run) is always used. Cleaned up related comments to reflect the FOSS label change.

* Add FOSS note type with green bullet

Added FOSS notes in the UI and FOSS labels with a green bullet instead of the text '#FOSS'

* Use larger circle glyph; remove italic text

Replaced the FOSS and list bullet glyphs with a larger circle for better visual consistency and removed the italic styling

* Update FOSS/bullet glyphs, colors and sizes

Updated FOSS/list bullet styling by switching glyphs from U+2B24 to U+25CF, increasing size (10→11.5), and adjusting bullet/text colors for better visibility and consistency across.

functions/private/Invoke-WinutilThemeChange.ps1

@@ -150,18 +150,6 @@ function Invoke-WinutilThemeChange {
         }
     }
 
-    # Set FOSS Highlight Color
-    $fossEnabled = $true
-    if ($sync.WPFToggleFOSSHighlight) {
-        $fossEnabled = $sync.WPFToggleFOSSHighlight.IsChecked
-    }
-
-    if ($fossEnabled) {
-         $sync.Form.Resources["FOSSColor"] = [Windows.Media.SolidColorBrush]::new([Windows.Media.Color]::FromRgb(76, 175, 80)) # #4CAF50
-    } else {
-         $sync.Form.Resources["FOSSColor"] = $sync.Form.Resources["MainForegroundColor"]
-    }
-
     # Update the theme selector button with the appropriate icon
     $ThemeButton = $sync.Form.FindName("ThemeButton")
     $ThemeButton.Content = [string]$themeButtonIcon