refactor: unify desktop apps and Settings under item catalog

template/sysroot/include/gui/desktop.hpp

@@ -17,18 +17,34 @@ namespace gui {
 
 static constexpr int MAX_WINDOWS = 8;
 static constexpr int PANEL_HEIGHT = 32;
-static constexpr int MAX_EXTERNAL_APPS = 32;
 static constexpr int MAX_LAUNCHER_ITEMS = 64;
 
-// External app discovered from 0:/apps/ manifest
-struct ExternalApp {
+enum DesktopItemSection : uint8_t {
+    DESKTOP_ITEM_SECTION_HIDDEN = 0,
+    DESKTOP_ITEM_SECTION_APPS,
+    DESKTOP_ITEM_SECTION_SETTINGS,
+};
+
+enum DesktopItemLaunchKind : uint8_t {
+    DESKTOP_ITEM_LAUNCH_EXECUTABLE = 0,
+    DESKTOP_ITEM_LAUNCH_BUILTIN,
+};
+
+// Launchable desktop item discovered from an app manifest or supplied by the
+// desktop's built-in registry.
+struct DesktopItem {
+    char id[48];
     char name[48];
     char binary_path[128];
     char icon_path[128];
     char category[24];
     SvgIcon icon;
+    DesktopItemSection section;
+    DesktopItemLaunchKind launch_kind;
+    int builtin_id;
     bool menu_visible;
     bool launch_with_home;
+    bool admin_only;
 };
 
 enum LauncherItemKind : uint8_t {
@@ -152,9 +168,10 @@ struct DesktopState {
 
     SvgIcon icon_volume;
 
-    // External apps discovered from 0:/apps/ manifests
-    ExternalApp external_apps[MAX_EXTERNAL_APPS];
-    int external_app_count;
+    // Desktop items discovered from 0:/apps/ manifests (dynamically grown).
+    DesktopItem* desktop_items;
+    int desktop_item_count;
+    int desktop_item_capacity;
 
     bool ctx_menu_open;
     int ctx_menu_x, ctx_menu_y;