refactor(ui): action-first flow with immediate save #5051

Job	Run time
discover	5s
benchmarks (cloud)	4m 22s
benchmarks (fs)	2m 20s
benchmarks (hcl/ast)	5m 3s
benchmarks (generate)	4m 7s
benchmarks (benchmarks/changed)	3m 57s
benchmarks (ls)	20m 26s
benchmarks (hcl/eval)	5m 39s
benchmarks (tg)	2m 17s
benchmarks (stdlib)	9m 45s
report	8s
	58m 9s

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