backport: Merge bitcoin/bitcoin#25977, 27357, 28583#7200

Open

vijaydasmp wants to merge 3 commits into

dashpay:developfrom

vijaydasmp:March_2026_6

Commits on Apr 28, 2026

Merge bitcoin/bitcoin#25977: refactor: Replace `std::optional<bilingual_str>` with `util::Result`

fanquake
authored and
vijaydasmp
committed
Merge bitcoin/bitcoin#27357: validation: Move warningcache to ChainstateManager and rename to m_warningcache

fanquake
authored and
vijaydasmp
committed
Merge bitcoin/bitcoin#28583: refactor: [tidy] modernize-use-emplace

fanquake
authored and
vijaydasmp
committed