passwd-user: allow clearing, allow setting expiry

Cargo.lock

@@ -285,8 +285,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "145052bdd345b87320e369255277e3fb5152762ad123a901ef5c262dd38fe8d2"
 dependencies = [
  "iana-time-zone",
+ "js-sys",
  "num-traits",
  "serde",
+ "wasm-bindgen",
  "windows-link",
 ]
 
@@ -1334,6 +1336,7 @@ dependencies = [
  "async-bincode",
  "bincode 2.0.1",
  "build-info-build",
+ "chrono",
  "clap",
  "clap-verbosity-flag",
  "clap_complete",