fix root cause: use Zotero-valid character set in key generators

The _zotero_key() functions in add_carrier_to_zotero.py,
add_zipcode_to_zotero.py, and bib/sync.py used ascii_uppercase +
digits which includes 0, 1, and O — characters outside Zotero's
allowed set [23456789ABCDEFGHIJKLMNPQRSTUVWXYZ].

dev/scripts/add_carrier_to_zotero.py

@@ -52,8 +52,8 @@ TAG_YEARS = {2010: 36, 2017: 20}
 
 
 def _zotero_key() -> str:
-    """Generate a random 8-char Zotero key (uppercase + digits)."""
-    chars = string.ascii_uppercase + string.digits
+    """Generate a random 8-char Zotero key using the allowed character set."""
+    chars = "23456789ABCDEFGHIJKLMNPQRSTUVWXYZ"
     return "".join(random.choices(chars, k=8))
 
 

dev/scripts/add_zipcode_to_zotero.py

@@ -91,7 +91,8 @@ TAG_MODULE_PFS = 8
 
 
 def _zotero_key() -> str:
-    chars = string.ascii_uppercase + string.digits
+    """Generate a random 8-char Zotero key using the allowed character set."""
+    chars = "23456789ABCDEFGHIJKLMNPQRSTUVWXYZ"
     return "".join(random.choices(chars, k=8))
 
 

src/bib/sync.py

@@ -22,7 +22,6 @@ from __future__ import annotations
 import json
 import random
 import sqlite3
-import string
 from datetime import datetime, timezone
 
 from bib.item import Item
@@ -67,8 +66,8 @@ _FIELD_IDS = {
 
 
 def _zotero_key() -> str:
-    """Generate an 8-char Zotero-style key."""
-    chars = string.ascii_uppercase + string.digits
+    """Generate an 8-char Zotero key using the allowed character set."""
+    chars = "23456789ABCDEFGHIJKLMNPQRSTUVWXYZ"
     return "".join(random.choices(chars, k=8))  # noqa: S311