Update and closing 266th online meetup 2025 12 20#513

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jongfeel wants to merge 2 commits intomainfrom

508-266th-online-meetup-2025-12-20

Commits on Dec 24, 2025

Update joined count ranking table until 266th online meetup
jongfeel
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Add joined stamps, starbucks mobile gift and book count on 266th online meetup
jongfeel
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