Fix #433: open only file URLs handed to the app (macOS 27 turns an https URL into a path)

`application:openURLs:` can pass URLs that aren't files, and on macOS 27 `to_file_path()` returns
the path of an https URL ("/a.svg"), so it was queued as a document. Keep the file URLs
(`isFileURL`) before converting; `opened_files_wait_for_the_ui` passes again on macOS 27.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/vectorcraft/src/open_documents.rs

@@ -78,7 +78,8 @@ fn add_open_urls_method() {
 
 /// Queue the files among `urls` and wake the UI. Never panics: it runs inside AppKit.
 extern "C-unwind" fn open_urls(_delegate: &AnyObject, _cmd: Sel, _app: &AnyObject, urls: &NSArray<NSURL>) {
-    let paths = urls.iter().filter_map(|u| u.to_file_path()).map(|p| p.to_string_lossy().into_owned());
+    // Only file URLs: macOS 27 turns an https URL's path into a file path too (#433).
+    let paths = urls.iter().filter(|u| u.isFileURL()).filter_map(|u| u.to_file_path()).map(|p| p.to_string_lossy().into_owned());
     PENDING.lock().unwrap_or_else(PoisonError::into_inner).extend(paths);
     if let Some(ctx) = UI.get() {
         ctx.request_repaint();