Add WCAG 2.2 AAA compliance and automated AT-SPI audit tool

- Bring all UI widgets to WCAG 2.2 AAA conformance across all views
- Add accessible labels, roles, descriptions, and announcements
- Bump focus outlines to 3px, target sizes to 44px AAA minimum
- Fix announce()/announce_result() to walk widget tree via parent()
- Add AT-SPI accessibility audit script (tools/a11y-audit.py) that
  checks SC 4.1.2, 1.1.1, 1.3.1, 2.1.1, 2.5.5, 2.5.8, 2.4.8,
  2.4.9, 2.4.10, 2.1.3 with JSON report output for CI
- Clean up project structure, archive old plan documents

src/ui/updates_view.rs

@@ -7,7 +7,7 @@ use gtk::gio;
 use crate::config::APP_ID;
 use crate::core::database::Database;
 use crate::core::updater;
-use crate::i18n::i18n;
+use crate::i18n::{i18n, ni18n_f};
 use crate::ui::update_dialog;
 use crate::ui::widgets;
 
@@ -23,10 +23,11 @@ pub fn build_updates_view(db: &Rc<Database>) -> adw::ToolbarView {
     header.set_title_widget(Some(&title));
 
     // Check Now button
-    let check_btn = gtk::Button::builder()
-        .icon_name("view-refresh-symbolic")
-        .tooltip_text(&i18n("Check for updates (Ctrl+U)"))
-        .build();
+    let check_btn = widgets::accessible_icon_button(
+        "view-refresh-symbolic",
+        "Check for updates",
+        &i18n("Check for updates (Ctrl+U)"),
+    );
     header.pack_end(&check_btn);
 
     // Update All button (only visible when updates exist)
@@ -60,6 +61,7 @@ pub fn build_updates_view(db: &Rc<Database>) -> adw::ToolbarView {
         .height_request(32)
         .halign(gtk::Align::Center)
         .build();
+    spinner.update_property(&[gtk::accessible::Property::Label("Checking for updates")]);
     checking_page.set_child(Some(&spinner));
     stack.add_named(&checking_page, Some("checking"));
 
@@ -157,7 +159,7 @@ pub fn build_updates_view(db: &Rc<Database>) -> adw::ToolbarView {
                 // Re-read records from the shared db so UI picks up changes from the bg thread
                 drop(fresh_db);
                 populate_update_list(&state_c);
-                state_c.toast_overlay.add_toast(adw::Toast::new(&i18n("Update check complete")));
+                state_c.toast_overlay.add_toast(widgets::info_toast(&i18n("Update check complete")));
             });
         });
     }
@@ -198,7 +200,7 @@ pub fn build_updates_view(db: &Rc<Database>) -> adw::ToolbarView {
                 let count = result.unwrap_or(0);
                 if count > 0 {
                     state_c.toast_overlay.add_toast(
-                        adw::Toast::new(&format!("{} apps updated", count)),
+                        widgets::info_toast(&ni18n_f("{} app updated", "{} apps updated", count, &[("{}", &count.to_string())])),
                     );
                 }
                 populate_update_list(&state_c);
@@ -257,7 +259,9 @@ fn populate_update_list(state: &Rc<UpdatesState>) {
 
     state.stack.set_visible_child_name("updates");
     state.update_all_btn.set_visible(true);
-    state.title.set_subtitle(&format!("{} updates available", updatable.len()));
+    let count = updatable.len();
+    state.title.set_subtitle(&format!("{} updates available", count));
+    widgets::announce(state.list_box.upcast_ref::<gtk::Widget>(), &format!("{} updates available", count));
 
     for record in &updatable {
         let name = record.app_name.as_deref().unwrap_or(&record.filename);
@@ -284,8 +288,9 @@ fn populate_update_list(state: &Rc<UpdatesState>) {
             .expanded(false)
             .build();
 
-        // App icon
+        // App icon (decorative - row title already names the app)
         let icon = widgets::app_icon(record.icon_path.as_deref(), name, 32);
+        icon.set_accessible_role(gtk::AccessibleRole::Presentation);
         row.add_prefix(&icon);
 
         // "What's new" content inside the expander
@@ -317,6 +322,7 @@ fn populate_update_list(state: &Rc<UpdatesState>) {
             .tooltip_text(&i18n("Update this app"))
             .css_classes(["flat"])
             .build();
+        update_btn.update_property(&[gtk::accessible::Property::Label(&format!("Update {}", name))]);
 
         let app_id = record.id;
         let update_url = record.update_url.clone();
@@ -355,11 +361,11 @@ fn populate_update_list(state: &Rc<UpdatesState>) {
                 btn_c.set_sensitive(true);
                 if result.unwrap_or(false) {
                     state_c.toast_overlay.add_toast(
-                        adw::Toast::new(&i18n("Update complete")),
+                        widgets::info_toast(&i18n("Update complete")),
                     );
                 } else {
                     state_c.toast_overlay.add_toast(
-                        adw::Toast::new(&i18n("Update failed")),
+                        widgets::error_toast(&i18n("Update failed")),
                     );
                 }
                 populate_update_list(&state_c);