Update app.py

app.py

@@ -86,7 +86,7 @@ def map_type_to_category(item_type: str) -> str:
     Falls back to 'unknown' if no reasonable match is found.
     """
     if not item_type:
-        return "unknown"
+        return "others"
     t = item_type.strip().lower()
     # direct hit
     if t in CATEGORIES:
@@ -103,7 +103,7 @@ def map_type_to_category(item_type: str) -> str:
     for token in t.replace("_", " ").split():
         if token in CATEGORIES:
             return token
-    return "unknown"
+    return "others"
 
 
 # ---------- Firebase init helpers ----------