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perf(tui): stop rejoining streaming markdown on every retext #4243

Job	Run time
session-store perf baseline	15s
test (3/4)	44s
test (1/4)	41s
test (4/4)	1m 23s
build	17s
static-analysis	43s
test (2/4)	50s
test (one-process pollution detector)	-1s
eslint	4s
prettier	3s
typecheck	2s
test (src)	3s
build-and-test	3s
	5m 7s