Apply PR #23846: Themes aagain #1581

Job	Run time
compute-hash (x86_64-linux, blacksmith-4vcpu-ubuntu-2404)	1m 29s
compute-hash (x86_64-darwin, macos-15-intel)	38m 5s
compute-hash (aarch64-linux, blacksmith-4vcpu-ubuntu-2404-arm)	3m 29s
compute-hash (aarch64-darwin, macos-latest)	29m 15s
update-hashes	18s
	1h 12m 36s

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