Handle (connect, None) timeout tuples correctly

Match only int/float read values in the tuple case, so (5, None)
falls through to effective = None instead of raising TypeError.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: adamtheturtle

src/mock_vws/_requests_mock_server/decorators.py

@@ -168,8 +168,8 @@ def wrapped(
             # tuple. The delay simulates server response
             # time, so compare against the read timeout.
             match timeout:
-                case tuple():
-                    effective: float | None = float(timeout[1])
+                case (_, int() | float() as read_timeout):
+                    effective: float | None = float(read_timeout)
                 case int() | float():
                     effective = float(timeout)
                 case _: