Implements admin-only Display settings with generation-checked
Apply, Save, Load, Defaults, and Reset operations across the web UI,
CLI, SSH dispatcher, and local UI owner. Adds bounded HTTP handling,
session-isolated operation results, browser lifecycle support, and
comprehensive host tests and documentation.
Add fixed status icons, OLED dimming and wake behavior, lowercase
glyphs, and access-point metadata tracking. Update validation guidance,
roadmap status, and provide an icon layout mockup with licensing.