Add FreshAir Live air quality app

[cjanderson16]

Adds FreshAir Live, an OpenWeather-powered air quality app for Tidbyt.

Features:

• Current OpenWeather Air Quality Level
• Dominant pollutant and concentration
• Color-coded pollutant gauge
• Likely pollution source (heuristic)
• Current, +6 hour, and +12 hour outlook

Users provide their own OpenWeather API key and location through the app settings.

Validated locally with:

pixlet check apps/freshairlive/freshairlive.star

[tidbyt]

⚠️ The automated review process is experimental and likely has bugs. Please bear with us as we iron out the kinks and enable you to ship changes at high velocity 🚀

Next Steps

Hello! Thank you so much for your change 🤜 🤛 . There are a few things you need to do:

• Sign the CLA if you haven't already
• Ensure your build is green! Any problem will display a proposed solution to try out
• Get a review, either by Tidbyt Bot or by a Tidbyt engineer

Manual Review Required

Hang tight! A Tidbyt engineer will be by shortly to review your change. Here is what they will be looking for:

	Test	Details
✅	App Dir	All files are in a single app directory
🟡	Modules	Usage of http.star requires review
✅	Original Author	The original author matches the PR author

[tidbyt-bot]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[cjanderson16]

I have read the CLA Document and I hereby sign the CLA