ws039: extend sidebar probe with row preview + unread state

ws038 confirmed the sidebar row exposes NO conversation/talk id (only name + btm
tracking ids), and the display name 'sc' is NOT in the WS stream — so there is no
shared id to map a nameless WS card to its DOM row. The only mis-delivery-safe
bridge is content-anchored (match the row by what the card looks like).

Extend dumpRowIds() to also capture _preview (readRowPreview) and _unread, so the
next run shows exactly what a card-only conversation's sidebar preview says (e.g.
"[商品]") and whether it's flagged unread. Those become the correlators for the
content-matched delivery fix. Still diagnostic-only, still fires only on the
name-match-miss path.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: scszcoder

agent/ec_skills/browser_use_extension/extension_tools_service.py

@@ -4504,10 +4504,16 @@ async def feige_get_chat_thread(params: FeigeGetChatThreadAction, browser_sessio
     return idEl ? String(idEl.getAttribute('data-btm') || '').trim() : '';
   }
   function dumpRowIds(row) {
-    // ws038 diagnostic: collect every id-candidate attribute (data-* / id / href)
-    // on the row AND its descendants, so the next run reveals whether the sidebar
-    // exposes a stable conversation/talk id anywhere (none is documented today).
-    var out = { _name: readRowName(row) };
+    // ws038/ws039 diagnostic: id-candidate attributes (data-* / id / href on the
+    // row AND descendants) PLUS the row preview + unread state. Card-only convs
+    // expose no conv id to map, so a content-anchored delivery matcher needs to
+    // know what a card row's preview actually says (e.g. "[商品]") and whether the
+    // row is unread — those become the only safe correlators to the WS card.
+    var out = { _name: readRowName(row), _preview: readRowPreview(row) };
+    try {
+      var ub = row.querySelector ? row.querySelector('.rxAvaVFJHvpEGMc1ejm1, [class*="unread"]') : null;
+      out._unread = ub ? ((ub.textContent || '').trim() || 'dot') : '';
+    } catch (e2) {}
     try {
       var nodes = [row].concat(Array.prototype.slice.call(row.querySelectorAll('*')));
       for (var n = 0; n < nodes.length && n < 80; n++) {