feat(harmonia): adopt Harmonia 2.6.0 - slot-picker toolbar, month/week pickers, upstream skill #7902

Job	Run time
tests (windows)	20m 2s
docker-build (ubuntu-latest, amd64)	3m 48s
code-style	49s
smoke-tests	47m 56s
tests (ubuntu)	12m 56s
docker-build (ubuntu-24.04-arm, arm64)	4m 51s
	1h 30m 22s

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