Highlight board editor unplaced package list selection in schematic #1588

Job	Run time
stylecheck	21s
build-opensuse (all)	6m 12s
build-debug	15m 32s
build-opensuse (horizon.so)	5m 18s
build-arch (all)	6m 18s
build (ubuntu:focal, g++, gcc, all)	14m 54s
build-arch (horizon.so)	4m 40s
build-pr-review	3m 53s
build (ubuntu:focal, g++, gcc, horizon.so)	5m 13s
build (ubuntu:jammy, g++, gcc, all)	13m 29s
build (ubuntu:jammy, g++, gcc, horizon.so)	4m 11s
build (ubuntu:noble, g++, gcc, all)	15m 19s
build (ubuntu:noble, g++, gcc, horizon.so)	5m 11s
build (debian:bullseye, g++, gcc, all)	13m 10s
build (debian:bullseye, g++, gcc, horizon.so)	4m 24s
build (debian:bookworm, clang, clang, all)	13m 36s
build (debian:bookworm, clang, clang, horizon.so)	4m 28s
build (debian:bookworm, g++, gcc, all)	15m 9s
build (debian:bookworm, g++, gcc, horizon.so)	4m 43s
	2h 36m 1s

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