feat: add diagnostic logs for generation flows

app/editor.py

@@ -305,9 +305,10 @@ def is_logged_in(account) -> bool:
     return bool(login_status(account).get("logged_in"))
 
 
-def open_product(account, item_id) -> CDP:
+def open_product(account, item_id, on_step=None) -> CDP:
     """Open or reuse a product edit tab, navigate to a clean edit URL, and wait ready."""
 
+    _notify_collect_step(on_step, "open_product")
     host = _cdp_host(account)
     item_id = str(item_id)
     url = _product_url(account, item_id)
@@ -326,6 +327,7 @@ def open_product(account, item_id) -> CDP:
     except Exception:
         pass
     cdp.send("Page.navigate", {"url": url})
+    _notify_collect_step(on_step, "wait_ready")
     _wait_ready(cdp)
     return cdp
 
@@ -366,17 +368,20 @@ def download_cover(src, out_path) -> str:
     return out_path
 
 
-def collect(account, task) -> dict:
+def collect(account, task, on_step=None) -> dict:
     """Collect current title and cover snapshot before any edits."""
 
     item_id = _item_id(task)
-    cdp = open_product(account, item_id)
+    cdp = open_product(account, item_id, on_step=on_step)
     try:
+        _notify_collect_step(on_step, "read_title")
         old_title = read_title(cdp)
+        _notify_collect_step(on_step, "read_cover")
         old_cover_src = read_cover_src(cdp)
         out_path = _get(task, "old_cover_path")
         if not out_path:
             out_path = os.path.join(_image_root(account), f"{item_id}_old.jpg")
+        _notify_collect_step(on_step, "download_cover")
         old_cover_path = download_cover(old_cover_src, out_path)
         return {
             "old_title": old_title,
@@ -387,6 +392,15 @@ def collect(account, task) -> dict:
         _close_collected_product(cdp)
 
 
+
+def _notify_collect_step(callback, step):
+    if callback is None:
+        return
+    try:
+        callback(step)
+    except Exception:
+        pass
+
 def _close_collected_product(cdp):
     target_id = getattr(cdp, "target_id", None)
     created_by_app = bool(getattr(cdp, "created_by_app", False))