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/Initialize-InstallAppEntry.ps1

@@ -63,13 +63,14 @@ function Initialize-InstallAppEntry {
         $appName.Style = $sync.Form.Resources.AppEntryNameStyle
         $appName.Text = $Apps.$appKey.content
 
-        # Change color to Green if FOSS
+        # Add FOSS label after the name if FOSS
         if ($Apps.$appKey.foss -eq $true) {
-            $appName.SetResourceReference([Windows.Controls.Control]::ForegroundProperty, "FOSSColor")
-            $appName.FontWeight = "Bold"
-        }
+            $fossRun = [System.Windows.Documents.Run]::new(" $([char]0x25CF)")
+            $fossRun.Foreground = [Windows.Media.SolidColorBrush]::new([Windows.Media.Color]::FromRgb(110, 255, 114))
+            $fossRun.FontSize = 11.5
 
-        # Add the name to the Checkbox
+            [void]$appName.Inlines.Add($fossRun)
+        }
         $checkBox.Content = $appName
 
         # Add accessibility properties to make the elements screen reader friendly