Paste the picture when the clipboard text beside it is blank.

Hosts put whitespace in the text flavour ahead of the bitmap, and that empty text was taken as the paste.

apps/vectorcraft-web/src/web.rs

@@ -205,7 +205,8 @@ fn track_paste(pasted: &Rc<RefCell<Pasted>>) {
         let Some(data) = e.clipboard_data() else { return };
         let Some(files) = data.files().filter(|f| f.length() > 0) else { return };
         // Text is egui's, but for the address a browser's Copy Image puts next to the picture.
-        if data.get_data("text").is_ok_and(|t| !t.is_empty() && !is_address(&t)) {
+        // Blank text is not a caption. A picture pasted with it is still the picture.
+        if data.get_data("text").is_ok_and(|t| !t.trim().is_empty() && !is_address(&t)) {
             return;
         }
         e.prevent_default();