Add welcome wizard, desktop entry, and Nautilus extension

First-run welcome dialog with skill level and output location setup.
Desktop entry file for GNOME app launcher integration.
Nautilus Python extension with dynamic 'Process with Pixstrip' submenu
that reads both built-in and user presets.

pixstrip-gtk/src/main.rs

@@ -3,6 +3,7 @@ mod processing;
 mod settings;
 mod step_indicator;
 mod steps;
+mod welcome;
 mod wizard;
 
 use gtk::prelude::*;

pixstrip-gtk/src/welcome.rs

@@ -0,0 +1,197 @@
+use adw::prelude::*;
+
+#[allow(dead_code)]
+pub fn build_welcome_dialog() -> adw::Dialog {
+    let dialog = adw::Dialog::builder()
+        .title("Welcome to Pixstrip")
+        .content_width(500)
+        .content_height(450)
+        .build();
+
+    let nav_view = adw::NavigationView::new();
+
+    // Page 1: Welcome
+    let welcome_page = build_welcome_page();
+    nav_view.add(&welcome_page);
+
+    // Page 2: Skill level
+    let skill_page = build_skill_page();
+    nav_view.add(&skill_page);
+
+    // Page 3: Output defaults
+    let output_page = build_output_page();
+    nav_view.add(&output_page);
+
+    dialog.set_child(Some(&nav_view));
+    dialog
+}
+
+fn build_welcome_page() -> 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 status = adw::StatusPage::builder()
+        .title("Welcome to Pixstrip")
+        .description("A quick and powerful batch image processor.\nResize, convert, compress, strip metadata, watermark, and rename - all in a simple wizard.")
+        .icon_name("image-x-generic-symbolic")
+        .vexpand(true)
+        .build();
+
+    let next_button = gtk::Button::builder()
+        .label("Get Started")
+        .halign(gtk::Align::Center)
+        .build();
+    next_button.add_css_class("suggested-action");
+    next_button.add_css_class("pill");
+
+    content.append(&status);
+    content.append(&next_button);
+
+    adw::NavigationPage::builder()
+        .title("Welcome")
+        .tag("welcome")
+        .child(&content)
+        .build()
+}
+
+fn build_skill_page() -> 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("How much detail do you want?")
+        .css_classes(["title-2"])
+        .halign(gtk::Align::Start)
+        .build();
+
+    let subtitle = gtk::Label::builder()
+        .label("You can change this anytime in Settings.")
+        .css_classes(["dim-label"])
+        .halign(gtk::Align::Start)
+        .build();
+
+    let group = adw::PreferencesGroup::new();
+
+    let simple_row = adw::ActionRow::builder()
+        .title("Simple")
+        .subtitle("Fewer options visible, great for quick tasks. Advanced options are still available behind expanders.")
+        .activatable(true)
+        .build();
+    simple_row.add_prefix(&gtk::Image::from_icon_name("emblem-ok-symbolic"));
+    let simple_check = gtk::CheckButton::new();
+    simple_check.set_active(true);
+    simple_row.add_suffix(&simple_check);
+    simple_row.set_activatable_widget(Some(&simple_check));
+
+    let detailed_row = adw::ActionRow::builder()
+        .title("Detailed")
+        .subtitle("All options visible by default. Best for power users who want full control.")
+        .activatable(true)
+        .build();
+    detailed_row.add_prefix(&gtk::Image::from_icon_name("preferences-system-symbolic"));
+    let detailed_check = gtk::CheckButton::new();
+    detailed_check.set_group(Some(&simple_check));
+    detailed_row.add_suffix(&detailed_check);
+    detailed_row.set_activatable_widget(Some(&detailed_check));
+
+    group.add(&simple_row);
+    group.add(&detailed_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");
+
+    content.append(&title);
+    content.append(&subtitle);
+    content.append(&group);
+    content.append(&next_button);
+
+    adw::NavigationPage::builder()
+        .title("Skill Level")
+        .tag("skill-level")
+        .child(&content)
+        .build()
+}
+
+fn build_output_page() -> 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("Where should processed images go?")
+        .css_classes(["title-2"])
+        .halign(gtk::Align::Start)
+        .build();
+
+    let subtitle = gtk::Label::builder()
+        .label("You can change this per-batch or in Settings.")
+        .css_classes(["dim-label"])
+        .halign(gtk::Align::Start)
+        .build();
+
+    let group = adw::PreferencesGroup::new();
+
+    let subfolder_row = adw::ActionRow::builder()
+        .title("Subfolder next to originals")
+        .subtitle("Creates a 'processed' folder next to your images")
+        .activatable(true)
+        .build();
+    subfolder_row.add_prefix(&gtk::Image::from_icon_name("folder-symbolic"));
+    let subfolder_check = gtk::CheckButton::new();
+    subfolder_check.set_active(true);
+    subfolder_row.add_suffix(&subfolder_check);
+    subfolder_row.set_activatable_widget(Some(&subfolder_check));
+
+    let fixed_row = adw::ActionRow::builder()
+        .title("Fixed output folder")
+        .subtitle("Always save to the same folder")
+        .activatable(true)
+        .build();
+    fixed_row.add_prefix(&gtk::Image::from_icon_name("folder-open-symbolic"));
+    let fixed_check = gtk::CheckButton::new();
+    fixed_check.set_group(Some(&subfolder_check));
+    fixed_row.add_suffix(&fixed_check);
+    fixed_row.set_activatable_widget(Some(&fixed_check));
+
+    group.add(&subfolder_row);
+    group.add(&fixed_row);
+
+    let done_button = gtk::Button::builder()
+        .label("Start Using Pixstrip")
+        .halign(gtk::Align::Center)
+        .build();
+    done_button.add_css_class("suggested-action");
+    done_button.add_css_class("pill");
+
+    content.append(&title);
+    content.append(&subtitle);
+    content.append(&group);
+    content.append(&done_button);
+
+    adw::NavigationPage::builder()
+        .title("Output Location")
+        .tag("output-location")
+        .child(&content)
+        .build()
+}