chore(app): markdown playground in storyboard #43

Job	Run time
compute-hash (x86_64-linux, blacksmith-4vcpu-ubuntu-2404)	1s
compute-hash (aarch64-linux, blacksmith-4vcpu-ubuntu-2404-arm)	1s
compute-hash (x86_64-darwin, macos-15-intel)	48m 0s
compute-hash (aarch64-darwin, macos-latest)	26m 44s
update-hashes	-1s
	1h 14m 45s

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