Fetch default content when no URL hash is present (#242)

When animated-word-cloud.html loads without a hash fragment, fetch
the README.md from simonw/research rust-wordcloud and populate the
textarea with it, without auto-submitting.

https://claude.ai/code/session_01Cd6Lisz22DQh4z4iNmmYpU

Co-authored-by: Claude <noreply@anthropic.com>

Author: simonw

animated-word-cloud.html

@@ -620,6 +620,11 @@ <h1>Animated Word Cloud</h1>
     if (hashText) {
         textInput.value = hashText;
         generate(hashText);
+    } else {
+        fetch('https://raw.githubusercontent.com/simonw/research/refs/heads/main/rust-wordcloud/README.md')
+            .then(r => r.text())
+            .then(text => { textInput.value = text; })
+            .catch(() => {});
     }
 })();
 </script>