Add default application selector for browsers, email, and file managers

src/ui/detail_view.rs

@@ -1123,6 +1123,62 @@ fn build_system_tab(record: &AppImageRecord, db: &Rc<Database>, toast_overlay: &
         }
     }
 
+    // Default Application group
+    if let Some(ref cats) = record.categories {
+        let caps = integrator::detect_default_capabilities(cats);
+        if !caps.is_empty() && record.integrated {
+            let default_group = adw::PreferencesGroup::builder()
+                .title("Default Application")
+                .description(
+                    "Set this app as your system default for tasks it can handle."
+                )
+                .build();
+
+            let app_id = integrator::make_app_id(
+                record.app_name.as_deref().unwrap_or(&record.filename),
+            );
+
+            for cap in &caps {
+                let row = adw::ActionRow::builder()
+                    .title(cap.label())
+                    .build();
+
+                let set_btn = gtk::Button::builder()
+                    .label("Set Default")
+                    .valign(gtk::Align::Center)
+                    .build();
+                set_btn.add_css_class("flat");
+
+                let db_def = db.clone();
+                let record_id = record.id;
+                let app_id_clone = app_id.clone();
+                let cap_clone = cap.clone();
+                let toast_def = toast_overlay.clone();
+                set_btn.connect_clicked(move |btn| {
+                    match integrator::set_default_app(
+                        &db_def, record_id, &app_id_clone, &cap_clone,
+                    ) {
+                        Ok(()) => {
+                            toast_def.add_toast(adw::Toast::new(
+                                &format!("Set as default {}", cap_clone.label().to_lowercase()),
+                            ));
+                            btn.set_sensitive(false);
+                            btn.set_label("Default");
+                        }
+                        Err(e) => {
+                            log::error!("Failed to set default app: {}", e);
+                            toast_def.add_toast(adw::Toast::new("Failed to set default"));
+                        }
+                    }
+                });
+
+                row.add_suffix(&set_btn);
+                default_group.add(&row);
+            }
+            inner.append(&default_group);
+        }
+    }
+
     // Runtime Compatibility group
     let compat_group = adw::PreferencesGroup::builder()
         .title("Compatibility")