Implement post editor gallery image imports

crates/bds-ui/src/platform/dialog.rs

@@ -48,6 +48,31 @@ pub fn pick_media_files(title: String, filter_label: String) -> Task<Message> {
     )
 }
 
+/// Pick images for a persisted post's batch gallery workflow.
+pub fn pick_gallery_images(post_id: String, title: String, filter_label: String) -> Task<Message> {
+    Task::perform(
+        async move {
+            let result = tokio::task::spawn_blocking(move || {
+                std::panic::catch_unwind(|| {
+                    rfd::FileDialog::new()
+                        .set_title(&title)
+                        .add_filter(
+                            &filter_label,
+                            &["jpg", "jpeg", "png", "gif", "webp", "tiff", "bmp"],
+                        )
+                        .pick_files()
+                })
+                .map_err(|_| "native image picker failed".to_string())
+            })
+            .await
+            .map_err(|error| error.to_string())
+            .and_then(|result| result);
+            (post_id, result)
+        },
+        |(post_id, result)| Message::GalleryImagesPicked { post_id, result },
+    )
+}
+
 /// Pick a replacement image for an existing media item.
 pub fn pick_media_replacement(
     media_id: String,