refactor(helper/html): Prefer Array.isArray over instanceof Array

[exoego]

Array.isArray is more widely used in Hono codebase, specially in jsx and css.

Theoretical reason: https://github.com/sindresorhus/eslint-plugin-unicorn/blob/main/docs/rules/no-instanceof-array.md

And it's a bit shorter 😝

a instanceof Array // 18 chars
Array.isArray(a)  // 16 chars

The author should do the following, if applicable

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code
• Add TSDoc/JSDoc to document the code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.71%. Comparing base (4dd8b2b) to head (c2d55c3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3601   +/-   ##
=======================================
  Coverage   94.71%   94.71%           
=======================================
  Files         158      158           
  Lines        9555     9556    +1     
  Branches     2813     2810    -3     
=======================================
+ Hits         9050     9051    +1     
  Misses        505      505           

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[yusukebe]

LGTM!

[yusukebe]

@exoego

Yeah, we should use Array.isArray. Thank you!