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perf(tui): stop rejoining streaming markdown on every retext #4148

Job	Run time
build	12s
static-analysis	31s
test (2/4)	51s
test (4/4)	1m 19s
test (1/4)	41s
test (3/4)	45s
test (one-process pollution detector)	-1s
prettier	3s
typecheck	4s
eslint	4s
build-and-test	2s
test (src)	2s
	4m 33s