Format the expand instructions as a tip callout in the README

Author: robertpiosik

README.md

@@ -25,7 +25,9 @@
 
 Use popular chatbots in your browser, send API requests, or invoke agentic CLIs with CWC-constructed, lean [markdown prompts](#markdown-prompts). With a simple checkbox tick on a file tree, the context for the task is set and without any tool calling, the model generates accurate response in seconds.
 
-<small>Click to expand:</small>
+> [!TIP]
+>
+> Click ▶ to expand.
 
 <details>
 <summary><strong>Automated context selection</strong></summary>