Add portable mode with removable media detection and scanning

src/ui/app_card.rs

@@ -149,7 +149,12 @@ pub fn build_priority_badge(record: &AppImageRecord) -> Option<gtk::Label> {
         }
     }
 
-    // 3. Wayland issue (not Native or Unknown)
+    // 3. Portable / removable media
+    if record.is_portable {
+        return Some(widgets::status_badge("Portable", "info"));
+    }
+
+    // 4. Wayland issue (not Native or Unknown)
     if let Some(ref ws) = record.wayland_status {
         let status = WaylandStatus::from_str(ws);
         if status != WaylandStatus::Unknown && status != WaylandStatus::Native {

src/ui/detail_view.rs

@@ -1800,6 +1800,22 @@ fn build_storage_tab(
         .build();
     size_group.add(&appimage_row);
 
+    if record.is_portable {
+        let location_label = if let Some(ref mp) = record.mount_point {
+            format!("Portable ({})", mp)
+        } else {
+            "Portable (removable media)".to_string()
+        };
+        let location_row = adw::ActionRow::builder()
+            .title("Location")
+            .subtitle(&location_label)
+            .build();
+        let badge = widgets::status_badge("Portable", "info");
+        badge.set_valign(gtk::Align::Center);
+        location_row.add_suffix(&badge);
+        size_group.add(&location_row);
+    }
+
     if !fp.paths.is_empty() {
         let categories = [
             ("Configuration", fp.config_size),

src/ui/preferences.rs

@@ -265,6 +265,17 @@ fn build_behavior_page(settings: &gio::Settings) -> adw::PreferencesPage {
     });
     automation_group.add(&auto_integrate_row);
 
+    let removable_row = adw::SwitchRow::builder()
+        .title(&i18n("Watch removable media"))
+        .subtitle(&i18n("Scan USB drives and other removable media for AppImages"))
+        .active(settings.boolean("watch-removable-media"))
+        .build();
+    let settings_rem = settings.clone();
+    removable_row.connect_active_notify(move |row| {
+        settings_rem.set_boolean("watch-removable-media", row.is_active()).ok();
+    });
+    automation_group.add(&removable_row);
+
     page.add(&automation_group);
 
     // Backup group