Add custom workflow operation toggles, improve output step summary

pixstrip-gtk/src/steps/step_output.rs

@@ -16,7 +16,7 @@ pub fn build_output_page(state: &AppState) -> adw::NavigationPage {
         .margin_end(24)
         .build();
 
-    // Operation summary
+    // Operation summary - dynamically updated when this step is shown
     let summary_group = adw::PreferencesGroup::builder()
         .title("Operation Summary")
         .description("Review your processing settings before starting")
@@ -36,9 +36,14 @@ pub fn build_output_page(state: &AppState) -> adw::NavigationPage {
         .title("Output Directory")
         .build();
 
+    let default_output = state.output_dir.borrow()
+        .as_ref()
+        .map(|p| p.display().to_string())
+        .unwrap_or_else(|| "processed/ (subfolder next to originals)".to_string());
+
     let output_row = adw::ActionRow::builder()
         .title("Output Location")
-        .subtitle("processed/ (subfolder next to originals)")
+        .subtitle(&default_output)
         .activatable(true)
         .action_name("win.choose-output")
         .build();