Fix branch coverage in timeout handling

[adamtheturtle]

Summary

• Annotate the timeout variable with explicit types so pyright can narrow through tuple element access without needing type: ignore or cast
• Flatten the nested isinstance checks into two sequential if statements, which eliminates the uncoverable false branch (the inner isinstance(timeout[1], (int, float)) was always true when reached)

Test plan

• All 6 TestResponseDelay tests pass
• All pre-commit and pre-push hooks pass (pyright, mypy, ruff, vulture, etc.)

🤖 Generated with Claude Code

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Note

Low Risk
Small refactor in mock response-delay timeout logic; behavior should be equivalent aside from clearer tuple timeout handling and is covered by existing timeout tests.

Overview
Adjusts _wrap_callback timeout handling in src/mock_vws/_requests_mock_server/decorators.py to improve type narrowing and remove an effectively dead branch.

timeout is now explicitly typed, tuple timeouts are flattened by extracting the read-timeout element first, and the effective timeout is computed via a single isinstance check before potentially sleeping and raising requests.exceptions.Timeout.

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