Add wizard step-skipping for disabled operations

Steps for disabled operations (resize, adjustments, convert, compress,
metadata, watermark, rename) are automatically skipped when navigating
forward or backward. Jump-to-step also respects skip logic.

pixstrip-gtk/src/app.rs

@@ -423,14 +423,25 @@ fn build_menu() -> gtk::gio::Menu {
 fn setup_window_actions(window: &adw::ApplicationWindow, ui: &WizardUi) {
     let action_group = gtk::gio::SimpleActionGroup::new();
 
-    // Next step action
+    // Next step action (skips disabled steps)
     {
         let ui = ui.clone();
         let action = gtk::gio::SimpleAction::new("next-step", None);
         action.connect_activate(move |_, _| {
             let mut s = ui.state.wizard.borrow_mut();
-            if s.can_go_next() {
+            if !s.can_go_next() {
-                s.go_next();
+                return;
+            }
+            let total = s.total_steps;
+            let cfg = ui.state.job_config.borrow();
+            let mut next = s.current_step + 1;
+            while next < total && should_skip_step(next, &cfg) {
+                next += 1;
+            }
+            drop(cfg);
+            if next < total {
+                s.current_step = next;
+                s.visited[next] = true;
                 let idx = s.current_step;
                 drop(s);
                 navigate_to_step(&ui, idx);
@@ -439,18 +450,26 @@ fn setup_window_actions(window: &adw::ApplicationWindow, ui: &WizardUi) {
         action_group.add_action(&action);
     }
 
-    // Previous step action
+    // Previous step action (skips disabled steps)
     {
         let ui = ui.clone();
         let action = gtk::gio::SimpleAction::new("prev-step", None);
         action.connect_activate(move |_, _| {
             let mut s = ui.state.wizard.borrow_mut();
-            if s.can_go_back() {
+            if !s.can_go_back() {
-                s.go_back();
+                return;
+            }
+            let cfg = ui.state.job_config.borrow();
+            let mut prev = s.current_step.saturating_sub(1);
+            while prev > 0 && should_skip_step(prev, &cfg) {
+                prev = prev.saturating_sub(1);
+            }
+            drop(cfg);
+            s.current_step = prev;
+            s.visited[prev] = true;
             let idx = s.current_step;
             drop(s);
             navigate_to_step(&ui, idx);
-            }
         });
         action_group.add_action(&action);
     }
@@ -466,7 +485,9 @@ fn setup_window_actions(window: &adw::ApplicationWindow, ui: &WizardUi) {
             if let Some(step) = param.and_then(|p| p.get::<i32>()) {
                 let target = (step - 1) as usize;
                 let s = ui.state.wizard.borrow();
-                if target < s.total_steps && s.visited[target] {
+                let cfg = ui.state.job_config.borrow();
+                if target < s.total_steps && s.visited[target] && !should_skip_step(target, &cfg) {
+                    drop(cfg);
                     drop(s);
                     ui.state.wizard.borrow_mut().current_step = target;
                     navigate_to_step(&ui, target);
@@ -680,6 +701,20 @@ fn setup_window_actions(window: &adw::ApplicationWindow, ui: &WizardUi) {
     window.insert_action_group("win", Some(&action_group));
 }
 
+fn should_skip_step(step: usize, cfg: &JobConfig) -> bool {
+    match step {
+        0 | 1 | 9 => false, // Workflow, Images, Output - always shown
+        2 => !cfg.resize_enabled,
+        3 => !cfg.adjustments_enabled,
+        4 => !cfg.convert_enabled,
+        5 => !cfg.compress_enabled,
+        6 => !cfg.metadata_enabled,
+        7 => !cfg.watermark_enabled,
+        8 => !cfg.rename_enabled,
+        _ => false,
+    }
+}
+
 fn navigate_to_step(ui: &WizardUi, target: usize) {
     let s = ui.state.wizard.borrow();