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.

config/appnavigation.json

@@ -73,12 +73,11 @@
         "Order": "5",
         "Description": "Show the selected applications"
     },
-    "WPFToggleFOSSHighlight": {
-        "Content": "Highlight FOSS",
+    "WPFInstallFOSSInfo": {
+        "Content": "Free and Open Source Software",
         "Category": "__Selection",
-        "Type": "Toggle",
-        "Checked": true,
-        "Order": "6",
-        "Description": "Toggle the green highlight for FOSS applications"
+        "Type": "Note",
+        "Order": "0",
+        "Description": "Information about the #FOSS label on application entries"
     }
 }