Add a per-building status light in the upper-right corner (rotating with
the building) so production state is visible without selecting the
building: grey (nothing selected), green (producing), red (idle, input
missing), yellow (idle, output buffer full). Salvage Bay uses a two-state
variant (green with scrap, red when empty). Colors sourced from
visuals.toml [status_light].
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y7N59FsLA5e2kuVdqe4Uhc