Components that only exist in the hosted editor now advertise themselves in
the picker exactly like the online-only boards do: ONLINE_ONLY_COMPONENT_ADS
(same module as the board ads) renders an ONLINE-badged card that links to
velxio.com, auto-hidden in any build whose ComponentRegistry has the real
component (the hosted overlay merges it in — no per-build switches). First
entries: the M5Stack Chain RGB/Mono 8x8 matrices. componentDocs gains
registerComponentDoc(id, raw) so an overlay can supply the hover datasheet
for components it injects at runtime.
9e8381e032