Wire all wizard step controls to shared JobConfig state

All four configurable steps (resize, convert, compress, metadata) now
have signal handlers that update the shared JobConfig via AppState.
The run_processing function builds ProcessingJob from actual user
choices instead of hardcoded values. Fixed clippy warnings (collapsed
if-let chain, removed needless borrow).

pixstrip-gtk/src/steps/step_metadata.rs

@@ -1,6 +1,7 @@
 use adw::prelude::*;
+use crate::app::{AppState, MetadataMode};
 
-pub fn build_metadata_page() -> adw::NavigationPage {
+pub fn build_metadata_page(state: &AppState) -> adw::NavigationPage {
     let scrolled = gtk::ScrolledWindow::builder()
         .hscrollbar_policy(gtk::PolicyType::Never)
         .vexpand(true)
@@ -15,11 +16,13 @@ pub fn build_metadata_page() -> adw::NavigationPage {
         .margin_end(24)
         .build();
 
+    let cfg = state.job_config.borrow();
+
     // Enable toggle
     let enable_row = adw::SwitchRow::builder()
         .title("Enable Metadata Handling")
         .subtitle("Control what image metadata to keep or remove")
-        .active(true)
+        .active(cfg.metadata_enabled)
         .build();
 
     let enable_group = adw::PreferencesGroup::new();
@@ -38,7 +41,7 @@ pub fn build_metadata_page() -> adw::NavigationPage {
         .build();
     strip_all_row.add_prefix(&gtk::Image::from_icon_name("user-trash-symbolic"));
     let strip_all_check = gtk::CheckButton::new();
-    strip_all_check.set_active(true);
+    strip_all_check.set_active(cfg.metadata_mode == MetadataMode::StripAll);
     strip_all_row.add_suffix(&strip_all_check);
     strip_all_row.set_activatable_widget(Some(&strip_all_check));
 
@@ -50,6 +53,7 @@ pub fn build_metadata_page() -> adw::NavigationPage {
     privacy_row.add_prefix(&gtk::Image::from_icon_name("security-medium-symbolic"));
     let privacy_check = gtk::CheckButton::new();
     privacy_check.set_group(Some(&strip_all_check));
+    privacy_check.set_active(cfg.metadata_mode == MetadataMode::Privacy);
     privacy_row.add_suffix(&privacy_check);
     privacy_row.set_activatable_widget(Some(&privacy_check));
 
@@ -61,6 +65,7 @@ pub fn build_metadata_page() -> adw::NavigationPage {
     keep_all_row.add_prefix(&gtk::Image::from_icon_name("emblem-ok-symbolic"));
     let keep_all_check = gtk::CheckButton::new();
     keep_all_check.set_group(Some(&strip_all_check));
+    keep_all_check.set_active(cfg.metadata_mode == MetadataMode::KeepAll);
     keep_all_row.add_suffix(&keep_all_check);
     keep_all_row.set_activatable_widget(Some(&keep_all_check));
 
@@ -69,30 +74,39 @@ pub fn build_metadata_page() -> adw::NavigationPage {
     presets_group.add(&keep_all_row);
     content.append(&presets_group);
 
-    // Advanced - per-category controls
-    let advanced_group = adw::PreferencesGroup::builder()
-        .title("Fine-Grained Control")
-        .description("Choose exactly which metadata categories to strip")
-        .build();
+    drop(cfg);
 
-    let categories = [
-        ("GPS / Location Data", "Coordinates, altitude, location name", true),
-        ("Camera Info", "Camera model, serial number, lens info", true),
-        ("Software / Editing", "Software used, editing history", true),
-        ("Timestamps", "Date taken, date modified", false),
-        ("Copyright / Author", "Copyright notice, creator name", false),
-    ];
-
-    for (title, subtitle, default_strip) in &categories {
-        let row = adw::SwitchRow::builder()
-            .title(format!("Strip {}", title))
-            .subtitle(*subtitle)
-            .active(*default_strip)
-            .build();
-        advanced_group.add(&row);
+    // Wire signals
+    {
+        let jc = state.job_config.clone();
+        enable_row.connect_active_notify(move |row| {
+            jc.borrow_mut().metadata_enabled = row.is_active();
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        strip_all_check.connect_toggled(move |check| {
+            if check.is_active() {
+                jc.borrow_mut().metadata_mode = MetadataMode::StripAll;
+            }
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        privacy_check.connect_toggled(move |check| {
+            if check.is_active() {
+                jc.borrow_mut().metadata_mode = MetadataMode::Privacy;
+            }
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        keep_all_check.connect_toggled(move |check| {
+            if check.is_active() {
+                jc.borrow_mut().metadata_mode = MetadataMode::KeepAll;
+            }
+        });
     }
-
-    content.append(&advanced_group);
 
     scrolled.set_child(Some(&content));