Improve robustness of specifying Typst executable file name

[yusancky]

resolve #51

[Copilot]

Pull request overview

This pull request improves the robustness of specifying the Typst executable file name by implementing a standardized naming scheme and handling multiple executable names for the same version.

• Introduces logic to preserve a standard typst-${version} executable alongside custom executable names
• Adds caching logic to check for existing executables before re-copying them
• Updates code formatting (trailing commas) and documentation formatting throughout the codebase

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.

File	Description
src/main.ts	Implements the core logic for managing multiple executable names, including creating a versioned copy and renaming executables. Also includes extensive formatting changes (trailing commas).
README.md	Documents the new executable-name behavior, clarifying that a typst-${version} executable is always preserved and adds guidance on using multiple executable names. Also includes formatting improvements.
README_zh-Hans-CN.md	Chinese translation of the README documentation updates, including the same guidance on executable naming and formatting improvements.
.github/workflows/test.yml	Updates YAML formatting to use consistent double quotes and bracket styles for better code consistency.

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