feat(web): Add max height with scroll to chat input box

Prevents the chat box from growing unboundedly when a user pastes a large blob of text.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: brendan-kellam

packages/web/src/features/chat/components/chatBox/chatBox.tsx

@@ -298,7 +298,7 @@ const ChatBoxComponent = ({
             className={cn("flex flex-col justify-between gap-0.5 w-full px-3 py-2", className)}
         >
             <Editable
-                className="w-full focus-visible:outline-none focus-visible:ring-0 bg-background text-base disabled:cursor-not-allowed disabled:opacity-50 md:text-sm"
+                className="w-full focus-visible:outline-none focus-visible:ring-0 bg-background text-base disabled:cursor-not-allowed disabled:opacity-50 md:text-sm max-h-64 overflow-y-auto"
                 placeholder="Ask a question about your code. @mention files or select search scopes to refine your query."
                 renderElement={renderElement}
                 renderLeaf={renderLeaf}