fix(core): ui questionmark

tests/test_naming.py

@@ -9,9 +9,9 @@ def req(**kw):
     return SimpleNamespace(**base)
 
 
-def test_sanitize_replaces_forbidden_chars():
-    assert sanitize("Die drei ???") == "Die drei ？？？"
-    assert sanitize("a/b") == "a⧸b"
+def test_sanitize_keeps_special_chars_but_strips_separators():
+    assert sanitize("Die drei ???") == "Die drei ???"
+    assert sanitize("a/b\\c") == "abc"
     assert "\x01" not in sanitize("a\x01b")