refactor: Simplify TilesConverter.to_one_line_string() implementation

[Apricot-S]

This PR refactors the internal implementation of TilesConverter.to_one_line_string() to improve readability, maintainability, and type safety. There are no functional changes.

Changes

1. Simplified suit extraction logic (minor performance improvement)

Extraction and offset adjustment are now combined into a single list comprehension.
This reduces redundant loops and results in a small performance gain.

2. Early return in words()

Replaced the previous and/or conditional expression with an explicit if not suits: return "".
This makes the control flow clearer and easier to understand.

3. Introduced intermediate variables

Added man_words, pin_words, sou_words, and honors_words to clarify the flow of data and stabilize type inference.

4. Removed # type: ignore (made unnecessary by change 3)

The introduction of intermediate variables resolved the mypy type errors that previously required # type: ignore, allowing all ignores to be safely removed.