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* Refactor: improve query scope composition with merge syntax Replace manual WHERE clause concatenation with Rails' merge method for more elegant and maintainable scope composition across Card, Comment, and Filter models. This approach better follows Rails conventions and improves code readability. * Extend scope composition improvements to Card::Closeable Apply the same nested hash syntax pattern to closures table references in order and where clauses. * Remove unnecessary outer braces from where clause --------- Co-authored-by: Jeremy Daer <jeremy@37signals.com>