fix(ui): address review follow-ups

ui/src/components/IssueProperties.tsx

@@ -1,4 +1,4 @@
-import { useCallback, useMemo, useRef, useState } from "react";
+import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { pickTextColorForPillBg } from "@/lib/color-contrast";
 import { Link } from "@/lib/router";
 import type { Issue } from "@paperclipai/shared";
@@ -25,6 +25,7 @@ import { AgentIcon } from "./AgentIconPicker";
 function TruncatedCopyable({ value, icon: Icon }: { value: string; icon: React.ComponentType<{ className?: string }> }) {
   const [copied, setCopied] = useState(false);
   const timerRef = useRef<ReturnType<typeof setTimeout>>(undefined);
+  useEffect(() => () => clearTimeout(timerRef.current), []);
   const handleCopy = useCallback(async () => {
     try {
       await navigator.clipboard.writeText(value);

ui/src/components/MarkdownEditor.tsx

@@ -883,7 +883,7 @@ export const MarkdownEditor = forwardRef<MarkdownEditorRef, MarkdownEditorProps>
             !bordered && "inset-0 rounded-sm",
           )}
         >
-          Drop file to upload
+          Drop {onDropFile ? "file" : "image"} to upload
         </div>
       )}
       {uploadError && (