Extend Luma-style dark theme to two more Enact web overlays: - com.webos.app.notificationcenter: dark pills, transparent compositor, notification-specific components - com.webos.app.gameoptimizer: same plus GameItem, GameButton, GameSwitch, GamePanel custom components Rename build.js → build.cjs (ESM compat) and update to build all three themes from a single script. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>