fix: stabilize Shopee cover replacement

app/ai.py

@@ -12,9 +12,9 @@ import urllib.error
 import urllib.request
 import uuid
 
-from . import appconfig, db, diagnostics
+from . import appconfig, db, diagnostics, image_paths
 from . import prompts as prompt_module
-from .config import make_slug
+
 
 
 class AIError(RuntimeError):
@@ -390,16 +390,7 @@ def _account_name(task, account_by_alias):
 def _new_cover_path(task, account_by_alias, image_root):
     alias = str(getattr(task, "alias", "") or "").strip()
     account = account_by_alias.get(alias)
-    slug = getattr(account, "slug", None) if account is not None else None
-    if not slug:
-        slug = make_slug(alias or getattr(task, "account_name", "") or "unknown")
-    return os.path.abspath(
-        os.path.join(
-            image_root,
-            slug,
-            "%s_new.jpg" % getattr(task, "item_id", ""),
-        )
-    )
+    return image_paths.task_image_path(image_root, task, account, "new")
 
 
 def _mark_generate_failed(task, exc, db_path, on_task_update):