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refactor(tui): dedupe renderer tests, prompt builders, validators, labels, links, truncator #2547

Job	Run time
static-analysis	50s
test (1/4)	32s
test (3/4)	1m 5s
test (4/4)	35s
build	14s
test (2/4)	1m 1s
test (one-process pollution detector)	-1s
typecheck	3s
prettier	3s
eslint	2s
build-and-test	2s
test (src)	4s
	4m 30s