Add Ctrl+1/2/3 keyboard shortcuts for view switching

Register show-installed, show-catalog, and show-updates actions
with Ctrl+1, Ctrl+2, Ctrl+3 accelerators. Update the keyboard
shortcuts dialog to show the new navigation shortcuts.

src/window.rs

@@ -985,6 +985,43 @@ impl DriftwoodWindow {
         }
         self.add_action(&copy_path_action);
 
+        // View switching actions for keyboard shortcuts
+        let show_installed_action = gio::SimpleAction::new("show-installed", None);
+        {
+            let window_weak = self.downgrade();
+            show_installed_action.connect_activate(move |_, _| {
+                let Some(window) = window_weak.upgrade() else { return };
+                if let Some(vs) = window.imp().view_stack.get() {
+                    vs.set_visible_child_name("installed");
+                }
+            });
+        }
+        self.add_action(&show_installed_action);
+
+        let show_catalog_action = gio::SimpleAction::new("show-catalog", None);
+        {
+            let window_weak = self.downgrade();
+            show_catalog_action.connect_activate(move |_, _| {
+                let Some(window) = window_weak.upgrade() else { return };
+                if let Some(vs) = window.imp().view_stack.get() {
+                    vs.set_visible_child_name("catalog");
+                }
+            });
+        }
+        self.add_action(&show_catalog_action);
+
+        let show_updates_action = gio::SimpleAction::new("show-updates", None);
+        {
+            let window_weak = self.downgrade();
+            show_updates_action.connect_activate(move |_, _| {
+                let Some(window) = window_weak.upgrade() else { return };
+                if let Some(vs) = window.imp().view_stack.get() {
+                    vs.set_visible_child_name("updates");
+                }
+            });
+        }
+        self.add_action(&show_updates_action);
+
         // Keyboard shortcuts
         if let Some(app) = self.application() {
             let gtk_app = app.downcast_ref::<gtk::Application>().unwrap();
@@ -994,6 +1031,9 @@ impl DriftwoodWindow {
             gtk_app.set_accels_for_action("win.dashboard", &["<Control>d"]);
             gtk_app.set_accels_for_action("win.check-updates", &["<Control>u"]);
             gtk_app.set_accels_for_action("win.show-shortcuts", &["<Control>question"]);
+            gtk_app.set_accels_for_action("win.show-installed", &["<Control>1"]);
+            gtk_app.set_accels_for_action("win.show-catalog", &["<Control>2"]);
+            gtk_app.set_accels_for_action("win.show-updates", &["<Control>3"]);
         }
     }
 
@@ -1409,6 +1449,9 @@ impl DriftwoodWindow {
         let nav_group = adw::PreferencesGroup::builder()
             .title("Navigation")
             .build();
+        nav_group.add(&shortcut_row("Ctrl+1", "Installed"));
+        nav_group.add(&shortcut_row("Ctrl+2", "Catalog"));
+        nav_group.add(&shortcut_row("Ctrl+3", "Updates"));
         nav_group.add(&shortcut_row("Ctrl+F", "Search"));
         nav_group.add(&shortcut_row("Ctrl+D", "Dashboard"));
         nav_group.add(&shortcut_row("Ctrl+,", "Preferences"));