ensure no keyboard events leak through to the canvas

frontend/libs/components/promptbox/src/lib/PromptBox2D.tsx

@@ -235,11 +235,13 @@ export const PromptBox2D = ({
 
   const handlePaste = (e: React.ClipboardEvent<HTMLTextAreaElement>) => {
     e.preventDefault();
+    e.stopPropagation();
     const pastedText = e.clipboardData.getData("text").trim();
     setPrompt(pastedText);
   };
 
   const handleChange = (e: React.ChangeEvent<HTMLTextAreaElement>) => {
+    e.stopPropagation();
     setPrompt(e.target.value);
   };
 
@@ -444,9 +446,11 @@ export const PromptBox2D = ({
   };
 
   const handleKeyDown = (e: React.KeyboardEvent<HTMLTextAreaElement>) => {
+    // Stop propagation of keyboard events to prevent them from reaching the canvas
+    e.stopPropagation();
+    
     if (e.key === "Enter" && !e.shiftKey) {
       e.preventDefault();
-
       handleEnqueue();
     }
   };