docs(design): Fjord stays a fifth scheme beside Midnight

The trial is over: the owner kept it. The trial wording goes from the
tokens, the scheme list, the lab and DESIGN; B2's own-hue rule still
binds any new scheme.

frontend/src/design-lab/batchB.tsx

@@ -89,7 +89,7 @@ const SCHEMES: SchemeDef[] = [
     light: pal("#f4f5f0", "#ffffff", "#dfe3d8", "#161a14", "#5a6352", "#556b2f", "#ffffff"),
   },
   {
-    name: "Fjord · steel (trial)",
+    name: "Fjord · steel",
     dark: pal("#0d1225", "#121931", "#25506e", "#eef1f5", "#9fb0c4", "#5aa1cb", "#0d1225"),
     light: pal("#f3f6fa", "#ffffff", "#c9d6e3", "#152232", "#4f6278", "#256b8f", "#ffffff"),
   },
@@ -470,7 +470,7 @@ export function BatchB() {
         id="b2"
         code="B2"
         title="The scheme set"
-        rule="Four schemes, four hue families: Midnight blue, Forest cyan, Slate fuchsia, Matrix moss. YouTube and Starship are gone (a user on them lands on Midnight). Fjord is a trial outside the rule (Midnight's family, Playnite's steel accent): folded into Midnight or removed. Rule: an accent is ≥ 30° of OKLCH hue from danger, warn and success, and ≥ 4.5:1 as text and under its button text, dark and light."
+        rule="Five schemes: four hue families — Midnight blue, Forest cyan, Slate fuchsia, Matrix moss — and Fjord, the one kept exception (Midnight's navy, Playnite's calm steel accent). YouTube and Starship are gone (a user on them lands on Midnight). Rule: an accent is ≥ 30° of OKLCH hue from danger, warn and success, and ≥ 4.5:1 as text and under its button text, dark and light."
       >
         <div className="grid gap-2 grid-cols-[repeat(auto-fill,minmax(9.5rem,1fr))]">
           {SCHEMES.flatMap((s) =>