Swap the worktree-name emoji picker from emojibase-data's `github` shortcode preset to `emojibase`, which carries both `flag_kr` and `south_korea` style flag names, and drop the hand-maintained `kr` entry that patched around the gap. Filter skin-tone aliases so they neither crowd the suggestion list nor clobber base-emoji branch names.
Search now matches anywhere in the shortcode, ranked exact > prefix > word-start > substring, so `:korea` surfaces both Koreas.
Emoji-derived branch names now prefer spelled-out aliases: flags use country names (japan, germany, south-korea) and cryptic stubs are skipped (thumbsdown over no, victory over v).
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