dashboard/app: improve AI UI #18784

Job	Run time
aux	4m 1s
race_dashboard	3m 28s
race	7m 29s
build	3m 28s
dashboard	2m 48s
arch (presubmit_arch_executor)	3m 23s
arch (presubmit_arch_linux)	11m 11s
arch (presubmit_arch_windows)	3m 19s
gvisor	4m 15s
arch (presubmit_arch_netbsd)	4m 7s
arch (presubmit_arch_freebsd)	6m 30s
arch (presubmit_arch_openbsd)	4m 1s
arch (presubmit_arch_darwin)	3m 54s
old	7m 3s
	1h 8m 57s

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