fix: prevent ghost media from debounce buffer flatMap

When multiple messages arrive within the debounce window, the flush handler
was using entries.flatMap(e => e.allMedia) which merged media from ALL
buffered entries. This caused images from a previous photo message to
ghost-attach to subsequent text-only messages.

Fix: Use only the last entry's allMedia, matching how last.ctx is already
used as the authoritative context for the flushed message.

Fixes #46655

extensions/telegram/src/bot-handlers.buffers.ts

@@ -305,8 +305,11 @@ export function createTelegramInboundBufferRuntime(params: {
       const combinedText = entries
         .map((entry) => entry.msg.text ?? entry.msg.caption ?? "")
         .filter(Boolean)
-        .join("\n");
-      const combinedMedia = entries.flatMap((entry) => entry.allMedia);
+        .join("
+");
+      // Fix: only use last entry's media to prevent ghost attachments from debounce buffer
+      // See: https://github.com/openclaw/openclaw/issues/46655
+      const combinedMedia = entries.at(-1)?.allMedia ?? [];
       if (!combinedText.trim() && combinedMedia.length === 0) {
         return;
       }