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refactor(tui): use native fenced-code highlighting #2915

Job	Run time
test (1/4)	1m 24s
build	11s
test (2/4)	1m 2s
test (4/4)	57s
test (3/4)	39s
static-analysis	52s
test (one-process pollution detector)	0s
typecheck	2s
eslint	5s
prettier	2s
test (src)	4s
build-and-test	4s
	5m 22s