[4.x] Final fieldtype tweaks final v2 final_FINAL

[jackmcdade]

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[what-the-diff]

PR Summary

• Improve Array Fieldtype Appearance
  Remove unnecessary border-radius for a cleaner look.
• Add Focus Ring to Assets Modal
  Improve accessibility by highlighting the modal when focused.
• Enhance Grid Table Header Readability
  Fix text size and alignment, making it easier to read.
• Optimize Markdown Cheatsheet Helper Button Size
  Make the button smaller and remove padding for better overall design in AssetsFieldtype component.
• Improve Table Fieldtype Layout on Narrow Screens
  Remove fixed pixel widths and use flexbox for adaptable layout on various screen sizes.