frontend/package-lock.json changed (preact added to dashboard + shared
in the earlier commits on this branch) but the fixed-output npm-deps
hash pinned in nix/checks.nix, nix/packages/frontend.nix, and
nix/packages/swarm-ui.nix (all three hash the one shared lockfile,
per checks.nix's own comment) wasn't updated to match — argus caught
it on review. Recomputed with nix run nixpkgs#prefetch-npm-deps.
92bb5340b7