muse-chat-api.py upload: verify via Remove-attachment button

bin/muse-chat-api.py

@@ -341,26 +341,26 @@ def cmd_upload(ws, filepath, message=None, dry_run=False):
     cdp_call(ws, "DOM.setFileInputFiles",
              {"nodeId": node_id, "files": [os.path.abspath(filepath)]})
     time.sleep(2)
-    # Read-back: the attachment chip must appear. Match on the
-    # element's OWN text: React swaps the file input after change, so
-    # input.files is unreliable, and innerText on ancestors over-matches.
+    # Read-back: the attachment must be staged. React removes the
+    # file input after change, so input.files is unreliable — the
+    # composer's own signal is the "Remove attachment" button plus the
+    # chip text beside it.
     base = os.path.basename(filepath)
     preview = ev1(ws, """(() => {
-      const needle = %s;
-      const own = e => [...e.childNodes].filter(n => n.nodeType === 3)
-        .map(n => n.nodeValue).join('');
-      const hits = [...document.querySelectorAll('*')]
-        .filter(e => own(e).includes(needle))
-        .map(e => e.tagName + ': ' + own(e).slice(0, 80));
-      return JSON.stringify(hits.slice(0, 5));
-    })()""" % json.dumps(base))
+      const btns = [...document.querySelectorAll('button')].filter(b =>
+        (b.getAttribute('aria-label') || '') === 'Remove attachment');
+      if (!btns.length) return JSON.stringify([]);
+      const chip = btns[0].closest('div');
+      const text = chip ? chip.innerText.slice(0, 120) : '';
+      return JSON.stringify([{button: true, chip: text}]);
+    })()""")
     print("preview: %s" % preview)
     try:
         hits = json.loads(preview) if preview else []
     except Exception:
         hits = []
     if not hits:
-        print("ERROR: attachment preview not visible after attach",
+        print("ERROR: attachment not staged (no Remove-attachment button)",
               file=sys.stderr)
         sys.exit(1)
     if dry_run: