feat: add contextual copy menu for LLM context (#975)

<img width="941" height="682" alt="image"
src="https://github.com/user-attachments/assets/c135cf70-5011-402a-b89b-284532dd0319"
/>

Author: mattvollmer

docs/docs.json

@@ -79,5 +79,8 @@
     "ga4": {
       "measurementId": "G-D1HL4PBRSY"
     }
+  },
+  "contextual": {
+    "options": ["copy", "view", "chatgpt", "claude", "cursor", "vscode"]
   }
 }