backport : Merge bitcoin-core/gui#758, 27491#7296

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vijaydasmp wants to merge 2 commits intodashpay:developfrom

vijaydasmp:May_2026_03

Commits on Apr 29, 2026

Merge bitcoin-core/gui#758: Update Node window title with the chain type

hebasto
authored and
vijaydasmp
committed
Merge bitcoin/bitcoin#27491: refactor: Move chain constants to the util library

fanquake
authored and
vijaydasmp
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