feat(design): Fjord, a trial fifth scheme — Midnight's navy with a steel-blue accent and steel rules (E28)

frontend/src/lib/theme.ts

@@ -1,7 +1,7 @@
 import { LS, readAccountMerged, writeAccount } from "./storage";
 
 type Mode = "dark" | "light";
-export type Scheme = "midnight" | "forest" | "slate" | "matrix";
+export type Scheme = "midnight" | "forest" | "slate" | "matrix" | "fjord";
 
 // The scheme set (docs/DESIGN.md, decision B2): each earns its place with its own hue family, and its
 // accent stays ≥ 30° of OKLCH hue away from danger / warn / success. theme.contract.test.ts measures
@@ -11,6 +11,9 @@ export const SCHEMES: { id: Scheme; name: string; swatch: string }[] = [
   { id: "forest", name: "Forest", swatch: "#22d3ee" },
   { id: "slate", name: "Slate", swatch: "#e879f9" },
   { id: "matrix", name: "Matrix", swatch: "#86a05a" },
+  // A TRIAL outside B2 (Midnight's hue family, DESIGN.md decision log 2026-09-25): folded into
+  // Midnight or removed once the owner has tried it; a stored "fjord" then lands on the default.
+  { id: "fjord", name: "Fjord", swatch: "#5aa1cb" },
 ];
 
 export interface ThemePrefs {