Port WorldTabs, deselect-all, and save-performance fix to 1.21.11#2

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Copilot wants to merge 3 commits into

copilot/port-worldtabs-deselect-all-performance-fix

Commits on Apr 18, 2026

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Copilot
authored
Port WorldTabs, deselect all, and performance fix from 26.1 to 1.21.11

Copilot
and
StratCube2
authored
Address code review feedback: extract lambda constant, clarify lastKnownWorldIds update order

Copilot
and
StratCube2
authored