feat(fe): remove Settings page from dashboard

Hapus halaman /settings + nav item Settings (TopNav/HiddenSidebar
via navItems). GlassDivider ikut dihapus (cuma dipakai settings).
useConfig tetap (dipakai guild-selector).

Verifikasi: tsc PASS, biome 0 error, next build PASS (10 halaman
static, settings hilang).

services/frontend/src/components/glass/divider.tsx

@@ -1,9 +0,0 @@
-"use client";
-
-import { cn } from "@/lib/utils";
-
-export function GlassDivider({ className }: { className?: string }) {
-  return (
-    <div className={cn("h-px bg-gradient-to-r from-transparent via-oklch(1 0 0 / 0.08) to-transparent", className)} />
-  );
-}

services/frontend/src/components/glass/index.ts

@@ -1,3 +1,2 @@
 export { GlassCard } from "./card";
 export { GlassPanel } from "./panel";
-export { GlassDivider } from "./divider";