- edit_secure_note / edit_key now call the module's resolve_secret_multiline
instead of open-coding the eprintln-hint + read-to-EOF pattern (the helper
exists precisely to centralize this; build_secure_note/build_key already use it).
- drop redundant fn-local imports: `use zeroize::Zeroizing;` from the five edit_*
helpers and the re-imported `TotpAlgorithm` from edit_login/build_login
(all covered by module-level imports; leftover from the verbatim A2/A3 move).
- build_login passes the password_stdin flag through to resolve_secret_line for
consistency with build_card/build_totp (behavior identical — that branch is
only reached when password_stdin is true).
- restore #[allow(clippy::too_many_arguments)] on build_totp (8 args; the old
build_totp_item carried the same allow — signature is frozen for B/C).
