perf(flowchat): Improve long-session scrolling and history paging #6981

Job	Run time
Shell Deploy Scripts	13s
Build Impact	18s
Frontend Build	10m 25s
Impact-selected Linux / Relay Contract	0s
CLI Tests (${{ matrix.os }})	0s
Rust Build Check (${{ matrix.os }})	0s
DSH Profile Packaging (windows-latest)	0s
Rust / CLI Validation	6s
	11m 2s

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