feat: move Settings out of Files into its own searchable app with categories

programs/include/gui/desktop.hpp

@@ -49,6 +49,12 @@ struct DesktopItem {
     // File extensions the app opens (manifest files.types): lowercase, no dot,
     // space-separated with a leading and trailing space, e.g. " jpg jpeg ".
     char file_types[160];
+    // Settings app metadata (manifest [settings]): the category it is filed
+    // under ("" = not listed unless in the settings section), a one-line
+    // description and extra search words.
+    char settings_category[24];
+    char description[64];
+    char keywords[128];
 };
 
 enum LauncherItemKind : uint8_t {
@@ -225,8 +231,6 @@ struct DesktopState {
     SvgIcon icon_apps;
     SvgIcon icon_apps_lg;
     SvgIcon icon_system_configuration_menu;
-    SvgIcon icon_system_configuration;
-    SvgIcon icon_system_configuration_lg;
 
     // Special user folder icons (16x16 and 48x48)
     static constexpr int SPECIAL_FOLDER_COUNT = gui::SPECIAL_FOLDER_COUNT;