Fix/clipboard (#189)

* bugfix: clipboard error bug

* fix: use try-catch fallback for clipboard API instead of feature detection

---------

Co-authored-by: dayuan.jiang <jdy.toh@gmail.com>

components/chat-message-display.tsx

@@ -216,9 +216,29 @@ export function ChatMessageDisplay({
             setCopiedMessageId(messageId)
             setTimeout(() => setCopiedMessageId(null), 2000)
         } catch (err) {
-            console.error("Failed to copy message:", err)
+            // Fallback for non-secure contexts (HTTP) or permission denied
+            const textarea = document.createElement("textarea")
+            textarea.value = text
+            textarea.style.position = "fixed"
+            textarea.style.left = "-9999px"
+            textarea.style.opacity = "0"
+            document.body.appendChild(textarea)
+
+            try {
+                textarea.select()
+                const success = document.execCommand("copy")
+                if (!success) {
+                    throw new Error("Copy command failed")
+                }
+                setCopiedMessageId(messageId)
+                setTimeout(() => setCopiedMessageId(null), 2000)
+            } catch (fallbackErr) {
+                console.error("Failed to copy message:", fallbackErr)
                 setCopyFailedMessageId(messageId)
                 setTimeout(() => setCopyFailedMessageId(null), 2000)
+            } finally {
+                document.body.removeChild(textarea)
+            }
         }
     }