Adom Symbol

adom-symbol embed produces a symbol viewer that does not speak the lbr-hover bus that adom-lbr's footprint and 3D viewers (and the component widgets) use. On a component page, hovering a symbol pin no longer lights the footprint pad, and hovering a pad does not light the symbol pin.

Seen on adom/tps54202ddcr after replacing viewers/symbol.html with adom-symbol embed --file tps54202ddcr.kicad_sym.

Expected (the contract the footprint viewer uses):

• on pin enter: parent.postMessage({type:'lbr-hover', pin:'<number>', mpn}, '*'); on leave: pin:null
• on message with type:'lbr-hover': highlight the pin with that number, or clear on null

Workaround applied on that page: in the buildPinHits callbacks, post on enter/leave, plus a message listener that calls highlightPin (about 8 lines). Tested both directions against the footprint viewer in a relay harness.