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

programs/src/settings/manifest.toml

@@ -0,0 +1,18 @@
+[app]
+id = "settings"
+name = "Settings"
+binary = "settings.elf"
+icon = "preferences-system.svg"
+
+# The desktop lists Settings itself (the app menu footer entry and the
+# desktop context menu start this binary), so the manifest stays out of the
+# menus and out of its own list.
+[menu]
+category = "System"
+visible = false
+
+[desktop]
+section = "hidden"
+
+[launch]
+pass_home_dir = false