made selection actions insensitive when nothing is selected

src/packages_page/packages_page.blp

@@ -111,7 +111,7 @@ template $PackagesPage : Adw.BreakpointBin {
                             reveal-child: bind select_button.active;
                             transition-type: slide_up;
                             [center]
-                            Box {
+                            Box bottom_bar {
                                 styles ["toolbar"]
                                 hexpand: true;
                                 homogeneous: true;

src/packages_page/packages_page.py

@@ -32,6 +32,7 @@ class PackagesPage(Adw.BreakpointBin):
     packages_navpage = gtc()
     select_all_button = gtc()
     content_stack = gtc()
+    bottom_bar = gtc()
     copy_menu = gtc()
     copy_names = gtc()
     copy_ids = gtc()
@@ -114,8 +115,10 @@ class PackagesPage(Adw.BreakpointBin):
             
         if (total := len(self.selected_rows)) > 0:
             self.packages_navpage.set_title(_("{} Selected").format(total))
+            self.bottom_bar.set_sensitive(True)
         else:
             self.packages_navpage.set_title(_("Packages"))
+            self.bottom_bar.set_sensitive(False)
 
     def select_all_handler(self, *args):
         i = 0
@@ -126,6 +129,7 @@ class PackagesPage(Adw.BreakpointBin):
     def generate_list(self, *args):
         self.packages_list_box.remove_all()
         GLib.idle_add(lambda *_: self.filters_page.generate_filters())
+        self.bottom_bar.set_sensitive(False)
         if len(HostInfo.flatpaks) == 0:
             self.set_status(self.no_packages)
             return

src/widgets/app_row.blp

@@ -36,6 +36,7 @@ template $AppRow : Adw.ActionRow {
     }
     [suffix]
     CheckButton check_button {
+        margin-start: 6;
         styles["selection-mode"]
         visible: false;
     }