Add File Manager Integration page to welcome wizard

pixstrip-gtk/src/welcome.rs

@@ -35,6 +35,9 @@ fn build_welcome_dialog() -> adw::Dialog {
     let skill_page = build_skill_page(&nav_view);
     nav_view.add(&skill_page);
 
+    let fm_page = build_file_manager_page(&nav_view);
+    nav_view.add(&fm_page);
+
     let output_page = build_output_page(&dialog);
     nav_view.add(&output_page);
 
@@ -150,7 +153,7 @@ fn build_skill_page(nav_view: &adw::NavigationView) -> adw::NavigationPage {
             };
             let _ = store.save(&cfg);
         }
-        nav.push_by_tag("output-location");
+        nav.push_by_tag("file-manager");
     });
 
     content.append(&title);
@@ -165,6 +168,98 @@ fn build_skill_page(nav_view: &adw::NavigationView) -> adw::NavigationPage {
         .build()
 }
 
+fn build_file_manager_page(nav_view: &adw::NavigationView) -> adw::NavigationPage {
+    let content = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(12)
+        .margin_top(24)
+        .margin_bottom(24)
+        .margin_start(24)
+        .margin_end(24)
+        .build();
+
+    let title = gtk::Label::builder()
+        .label("File Manager Integration")
+        .css_classes(["title-2"])
+        .halign(gtk::Align::Start)
+        .build();
+
+    let subtitle = gtk::Label::builder()
+        .label("Add 'Process with Pixstrip' to your file manager's right-click menu.")
+        .css_classes(["dim-label"])
+        .halign(gtk::Align::Start)
+        .wrap(true)
+        .build();
+
+    let group = adw::PreferencesGroup::builder()
+        .title("Detected File Managers")
+        .description("Toggle integration for each file manager")
+        .build();
+
+    // Detect installed file managers
+    let file_managers = [
+        ("Nautilus", "org.gnome.Nautilus", "system-file-manager-symbolic"),
+        ("Nemo", "org.nemo.Nemo", "system-file-manager-symbolic"),
+        ("Thunar", "thunar", "system-file-manager-symbolic"),
+        ("Dolphin", "org.kde.dolphin", "system-file-manager-symbolic"),
+    ];
+
+    let mut found_any = false;
+    for (name, desktop_id, icon) in &file_managers {
+        // Check if the file manager is installed by looking for its .desktop file
+        let is_installed = gtk::gio::AppInfo::all()
+            .iter()
+            .any(|info| {
+                info.id()
+                    .map(|id| id.as_str().contains(desktop_id))
+                    .unwrap_or(false)
+            });
+
+        if is_installed {
+            found_any = true;
+            let row = adw::SwitchRow::builder()
+                .title(*name)
+                .subtitle(format!("Add right-click menu to {}", name))
+                .active(false)
+                .build();
+            row.add_prefix(&gtk::Image::from_icon_name(icon));
+            group.add(&row);
+        }
+    }
+
+    if !found_any {
+        let row = adw::ActionRow::builder()
+            .title("No supported file managers found")
+            .subtitle("You can configure this later in Settings")
+            .build();
+        row.add_prefix(&gtk::Image::from_icon_name("dialog-information-symbolic"));
+        group.add(&row);
+    }
+
+    let next_button = gtk::Button::builder()
+        .label("Continue")
+        .halign(gtk::Align::Center)
+        .build();
+    next_button.add_css_class("suggested-action");
+    next_button.add_css_class("pill");
+
+    let nav = nav_view.clone();
+    next_button.connect_clicked(move |_| {
+        nav.push_by_tag("output-location");
+    });
+
+    content.append(&title);
+    content.append(&subtitle);
+    content.append(&group);
+    content.append(&next_button);
+
+    adw::NavigationPage::builder()
+        .title("File Manager")
+        .tag("file-manager")
+        .child(&content)
+        .build()
+}
+
 fn build_output_page(dialog: &adw::Dialog) -> adw::NavigationPage {
     let content = gtk::Box::builder()
         .orientation(gtk::Orientation::Vertical)