refactor(jwt): reduce the size of the code generated by minification

[usualoma]

This refactoring aims to reduce the size of the code generated by minification.

• e53a89c : This is simply an omission of redundant conditions.
• 5d3ca90 : After placing it in an object, referencing it via key makes minify less effective, so I'll stop putting it in an object.
• eeaf13d : Simplify conditional branching with ternary operators
  • Some people might find this a bit hard to read, but it's not overly complex, and considering the code reduction it achieves, I think it's a good approach.

before

$ npx esbuild --minify dist/utils/jwt/jwt.js | wc
      1     152    2885

after

% npx esbuild --minify dist/utils/jwt/jwt.js | wc
       1     150    2715

The author should do the following, if applicable

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code

[usualoma]

@yusukebe
Would you please review this?

[usualoma]

Sorry, I had made a mistake, so I updated it.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.29%. Comparing base (5216117) to head (445fd34).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4480      +/-   ##
==========================================
- Coverage   91.30%   91.29%   -0.01%     
==========================================
  Files         173      173              
  Lines       11190    11180      -10     
  Branches     3228     3225       -3     
==========================================
- Hits        10217    10207      -10     
  Misses        972      972              
  Partials        1        1              

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[yusukebe]

LGTM!

[yusukebe]

@usualoma Looks good. Thank you!