Add scan button, sort dropdown, and improved empty state to library view

src/window.rs

@@ -649,6 +649,31 @@ impl DriftwoodWindow {
             show_drop_hint_action,
         ]);
 
+        // Sort library action (parameterized with sort mode string)
+        let sort_action = gio::SimpleAction::new("sort-library", Some(glib::VariantTy::STRING));
+        {
+            let window_weak = self.downgrade();
+            sort_action.connect_activate(move |_, param| {
+                let Some(window) = window_weak.upgrade() else { return };
+                let Some(mode_str) = param.and_then(|p| p.get::<String>()) else { return };
+                let lib_view = window.imp().library_view.get().unwrap();
+                let sort_mode = match mode_str.as_str() {
+                    "recent" => crate::ui::library_view::SortMode::RecentlyAdded,
+                    "size" => crate::ui::library_view::SortMode::Size,
+                    _ => crate::ui::library_view::SortMode::NameAsc,
+                };
+                lib_view.set_sort_mode(sort_mode);
+                let settings_key = match mode_str.as_str() {
+                    "recent" => "recently-added",
+                    "size" => "size",
+                    _ => "name",
+                };
+                let settings = gio::Settings::new(APP_ID);
+                settings.set_string("sort-mode", settings_key).ok();
+            });
+        }
+        self.add_action(&sort_action);
+
         // --- Batch actions ---
         let batch_integrate_action = gio::SimpleAction::new("batch-integrate", None);
         {