feat: Add SF Muni Trifecta app

[tonythomson]

Summary

Adds SF Muni Trifecta - an app that displays arrival times for up to three SF Muni stops simultaneously on a single screen.

Features

• Three independent rows - each row has its own route, stop, and direction (I/O)
• Dropdown selection for common Muni routes (N, J, K, L, M, T, F, 43, 48, and popular bus lines)
• Compact display with colored route circles (green, blue, purple) and arrival times
• Uses the 511.org real-time transit API

User Configuration

Users set up the app via the Tidbyt mobile app:

1. Enter their free 511.org API key (obtained at 511.org/open-data/token)
2. For each row: select route, enter stop code, choose direction (I/O)
3. Stop codes found at 511.org/transit/agencies/stop-id

Preview

Three rows showing route number, direction (I/O), and upcoming arrival times in minutes

Test Plan

• pixlet check passes
• App renders correctly with test configuration
• Schema fields display properly in configuration UI
• All three arrival times visible without truncation

[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

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• 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

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	Test	Details
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[tonythomson]

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

[tidbyt-bot]

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