fix(dwim-shell): valid zip name, real backup timestamp, reachable menu key

Three audit fixes. Single-file zip named the archive after the input file (<<fne>>.<<e>>), making invalid archives and a "foo." name for directories. It now builds <fne>.zip. The dated backup single-quoted $(date ...), so the stamp sat literal in the filename. Now the timestamp is interpolated in Elisp with format-time-string. The dired menu used "M-S-d", which Meta-Shift-d never emits (it sends M-D), so the menu was unreachable in plain dired. It now binds M-D, matching the dirvish sibling. Both command strings moved to top-level builders so they're unit-testable without loading the dwim-shell-command package.

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