Add Phase 5 enhancements: security, i18n, analysis, backup, notifications

- Database v8 migration: tags, pinned, avg_startup_ms columns
- Security scanning with CVE matching and batch scan
- Bundled library extraction and vulnerability reports
- Desktop notification system for security alerts
- Backup/restore system for AppImage configurations
- i18n framework with gettext support
- Runtime analysis and Wayland compatibility detection
- AppStream metadata and Flatpak-style build support
- File watcher module for live directory monitoring
- Preferences panel with GSettings integration
- CLI interface for headless operation
- Detail view: tabbed layout with ViewSwitcher in title bar,
  health score, sandbox controls, changelog links
- Library view: sort dropdown, context menu enhancements
- Dashboard: system status, disk usage, launch history
- Security report page with scan and export
- Packaging: meson build, PKGBUILD, metainfo

src/ui/library_view.rs

@@ -96,9 +96,28 @@ impl LibraryView {
             .title("Driftwood")
             .build();
 
+        // Add button (shows drop overlay)
+        let add_button_icon = gtk::Image::from_icon_name("list-add-symbolic");
+        let add_button_label = gtk::Label::new(Some(&i18n("Add app")));
+        let add_button_content = gtk::Box::builder()
+            .orientation(gtk::Orientation::Horizontal)
+            .spacing(6)
+            .build();
+        add_button_content.append(&add_button_icon);
+        add_button_content.append(&add_button_label);
+
+        let add_button = gtk::Button::builder()
+            .child(&add_button_content)
+            .tooltip_text(&i18n("Add AppImage"))
+            .build();
+        add_button.add_css_class("flat");
+        add_button.set_action_name(Some("win.show-drop-hint"));
+        add_button.update_property(&[AccessibleProperty::Label("Add AppImage")]);
+
         let header_bar = adw::HeaderBar::builder()
             .title_widget(&title_widget)
             .build();
+        header_bar.pack_start(&add_button);
         header_bar.pack_end(&menu_button);
         header_bar.pack_end(&search_button);
         header_bar.pack_end(&view_toggle_box);
@@ -175,8 +194,8 @@ impl LibraryView {
             .description(&i18n(
                 "Driftwood manages your AppImage collection - scanning for apps, \
                  integrating them into your desktop, and keeping them up to date.\n\n\
-                 Add AppImages to ~/Applications or ~/Downloads, or configure \
-                 custom scan locations in Preferences.",
+                 Drag AppImage files here, or add them to ~/Applications or ~/Downloads, \
+                 then use Scan Now to find them.",
             ))
             .child(&empty_button_box)
             .build();
@@ -196,13 +215,13 @@ impl LibraryView {
             .selection_mode(gtk::SelectionMode::None)
             .homogeneous(true)
             .min_children_per_line(2)
-            .max_children_per_line(4)
-            .row_spacing(14)
-            .column_spacing(14)
-            .margin_top(14)
-            .margin_bottom(14)
-            .margin_start(14)
-            .margin_end(14)
+            .max_children_per_line(5)
+            .row_spacing(12)
+            .column_spacing(12)
+            .margin_top(12)
+            .margin_bottom(12)
+            .margin_start(12)
+            .margin_end(12)
             .build();
         flow_box.update_property(&[AccessibleProperty::Label("AppImage library grid")]);
 
@@ -463,9 +482,14 @@ impl LibraryView {
         let name = record.app_name.as_deref().unwrap_or(&record.filename);
 
         // Structured two-line subtitle:
-        // Line 1: Description snippet or file path
+        // Line 1: Description snippet or file path (or "Analyzing..." if pending)
         // Line 2: Version + size
-        let line1 = if let Some(ref desc) = record.description {
+        let is_analyzing = record.app_name.is_none()
+            && record.analysis_status.as_deref() != Some("complete");
+
+        let line1 = if is_analyzing {
+            i18n("Analyzing...")
+        } else if let Some(ref desc) = record.description {
             if !desc.is_empty() {
                 let snippet: String = desc.chars().take(60).collect();
                 if snippet.len() < desc.len() {
@@ -496,7 +520,7 @@ impl LibraryView {
             .activatable(true)
             .build();
 
-        // Icon prefix (48x48 with rounded clipping and letter fallback)
+        // Icon prefix with rounded clipping and letter fallback
         let icon = widgets::app_icon(
             record.icon_path.as_deref(),
             name,
@@ -583,19 +607,19 @@ fn build_context_menu(record: &AppImageRecord) -> gtk::gio::Menu {
     // Section 2: Actions
     let section2 = gtk::gio::Menu::new();
     section2.append(Some("Check for Updates"), Some(&format!("win.check-update(int64 {})", record.id)));
-    section2.append(Some("Scan for Vulnerabilities"), Some(&format!("win.scan-security(int64 {})", record.id)));
+    section2.append(Some("Security check"), Some(&format!("win.scan-security(int64 {})", record.id)));
     menu.append_section(None, &section2);
 
     // Section 3: Integration + folder
     let section3 = gtk::gio::Menu::new();
-    let integrate_label = if record.integrated { "Remove Integration" } else { "Integrate" };
+    let integrate_label = if record.integrated { "Remove from app menu" } else { "Add to app menu" };
     section3.append(Some(integrate_label), Some(&format!("win.toggle-integration(int64 {})", record.id)));
-    section3.append(Some("Open Containing Folder"), Some(&format!("win.open-folder(int64 {})", record.id)));
+    section3.append(Some("Show in file manager"), Some(&format!("win.open-folder(int64 {})", record.id)));
     menu.append_section(None, &section3);
 
     // Section 4: Clipboard
     let section4 = gtk::gio::Menu::new();
-    section4.append(Some("Copy Path"), Some(&format!("win.copy-path(int64 {})", record.id)));
+    section4.append(Some("Copy file location"), Some(&format!("win.copy-path(int64 {})", record.id)));
     menu.append_section(None, &section4);
 
     menu