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fix(flowchat): settle the transcript viewport across reopen, history paging and navigation #4730

Job	Run time
Frontend Build	12m 9s
CLI Tests (macos-15)	8m 23s
Shell Deploy Scripts	14s
CLI Tests (ubuntu-latest)	12m 48s
Rust Build Check (windows-latest)	20m 23s
Rust Build Check (ubuntu-latest)	9m 49s
Rust Build Check (macos-15)	18m 31s
	1h 22m 17s