Add multi-color stripes to NYT Connections cycler

[brucehart]

Summary

• Adds multi-color hint support to the NYT Connections color cycler.

Changes

• Stores custom tile colors as a mask and renders diagonal stripes when more than one color is assigned.
• Updates click cycling and toolbar actions to add missing colors while preserving Clear and Clear All behavior.
• Documents multi-color behavior and the Ctrl-click selection workflow.

Testing

• node --check New York Times/NYT Connections Color Cycler-1.0.user.js
• git diff --check

Notes

• No live Tampermonkey browser test was run.