Merging the card and platform branches left two SHORT_HASH definitions, 8 and 12. The later one silently won, so the platform rows showed 12 characters while their tests expected 8. One constant now, 12, the card anchor's length. The copy-button selector skips buttons that carry their own data-copy, and the tests follow the merged markup.
The install box's select had a rule of its own that dropped the arrow
and read as a text field. It now takes the shared select rule and
--rb-select-arrow in both themes.
System and emulator file cards show the name, size, download, a short
SHA1 with a copy button, the setups and the emulators. The full hashes
and the other facts sit in one closed fold, each hash with a copy button.
A system's install box shows one command under the OS tabs for the
setup picked in a list, remembered across pages. Without the script the
list of every command shows, open. The Markdown the page budgets are
measured on is unchanged, so no card moves.