subway-e-ink-tracker

Add BirdNET bird screens (#7)

Refactor: Add second screens, data hub, and displays (#6)

Approach A: relative-rect panes — render each pane into its own tile (#5)

Pane-based layout: Screen/Pane structure, drawing relocated into a panes package (#4)

Deterministic rendering + golden-view tests, and distinct subway service states (#3)