feat: add RigPanel UI to drive a retarget (clip picker, diagnostic preview, write handoff) #13857

Job	Run time
Plan test impact	16s
Server tests (1/1)	1m 33s
Client tests and build (1/1)	5m 49s
DB tests	-1s
Windows server unit tests (${{ matrix.shard }}/${{ strategy.job-total }})	-1s
CI Gate	3s
Full CI Gate	0s
	7m 39s

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