feat(devtools): display file size in devtools

[qwerzl]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

@danielroe

Closes #460. Also includes some minor UI changes in order to fit the badge in.

Currently the file size is considered:

• good if <30KB;
• moderate if <100KB;
• bad if >100KB.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.08%. Comparing base (a90d7a0) to head (5e8db2c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #462   +/-   ##
=======================================
  Coverage   82.08%   82.08%           
=======================================
  Files          13       13           
  Lines        1066     1066           
  Branches      287      287           
=======================================
  Hits          875      875           
  Misses        181      181           
  Partials       10       10           

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