feat: add demo mode feature flag using Redacted Script font

packages/web/src/components/layout/Sidebar.tsx

@@ -1,6 +1,17 @@
 import { Link, useMatchRoute } from "@tanstack/react-router";
 import { motion } from "framer-motion";
-import { Boxes, Brain, ChevronRight, LayoutDashboard, Moon, Settings, Sun } from "lucide-react";
+import {
+	Boxes,
+	Brain,
+	ChevronRight,
+	Eye,
+	EyeOff,
+	LayoutDashboard,
+	Moon,
+	Settings,
+	Sun,
+} from "lucide-react";
+import { useDemo } from "@/hooks/useDemo";
 import { useTheme } from "@/hooks/useTheme";
 import { loadConfig } from "@/lib/config";
 import { COLOR } from "@/lib/constants";
@@ -15,6 +26,7 @@ export function Sidebar() {
 	const matchRoute = useMatchRoute();
 	const config = loadConfig();
 	const { theme, toggle } = useTheme();
+	const { demo, toggle: toggleDemo } = useDemo();
 
 	return (
 		<motion.aside
@@ -110,23 +122,42 @@ export function Sidebar() {
 				<p className="text-xs font-mono hidden sm:block" style={{ color: "var(--text-4)" }}>
 					API v3
 				</p>
-				<button
-					type="button"
-					onClick={toggle}
-					className="w-7 h-7 rounded-md flex items-center justify-center transition-colors mx-auto sm:mx-0"
-					style={{
-						background: "var(--surface)",
-						border: "1px solid var(--border)",
-						color: "var(--text-3)",
-					}}
-					title={theme === "dark" ? "Switch to light mode" : "Switch to dark mode"}
-				>
-					{theme === "dark" ? (
-						<Sun className="w-3.5 h-3.5" strokeWidth={1.5} />
-					) : (
-						<Moon className="w-3.5 h-3.5" strokeWidth={1.5} />
-					)}
-				</button>
+				<div className="flex items-center gap-1.5 mx-auto sm:mx-0">
+					<button
+						type="button"
+						onClick={toggleDemo}
+						className="w-7 h-7 rounded-md flex items-center justify-center transition-colors"
+						style={{
+							background: demo ? "var(--accent-dim)" : "var(--surface)",
+							border: `1px solid ${demo ? "var(--accent-border)" : "var(--border)"}`,
+							color: demo ? "var(--accent-text)" : "var(--text-3)",
+						}}
+						title={demo ? "Disable demo mode" : "Enable demo mode"}
+					>
+						{demo ? (
+							<EyeOff className="w-3.5 h-3.5" strokeWidth={1.5} />
+						) : (
+							<Eye className="w-3.5 h-3.5" strokeWidth={1.5} />
+						)}
+					</button>
+					<button
+						type="button"
+						onClick={toggle}
+						className="w-7 h-7 rounded-md flex items-center justify-center transition-colors"
+						style={{
+							background: "var(--surface)",
+							border: "1px solid var(--border)",
+							color: "var(--text-3)",
+						}}
+						title={theme === "dark" ? "Switch to light mode" : "Switch to dark mode"}
+					>
+						{theme === "dark" ? (
+							<Sun className="w-3.5 h-3.5" strokeWidth={1.5} />
+						) : (
+							<Moon className="w-3.5 h-3.5" strokeWidth={1.5} />
+						)}
+					</button>
+				</div>
 			</div>
 		</motion.aside>
 	);

packages/web/src/hooks/useDemo.ts

@@ -0,0 +1,16 @@
+import { useEffect, useState } from "react";
+import { applyDemoMode, getDemoMode } from "@/lib/demo";
+
+export function useDemo() {
+	const [demo, setDemo] = useState<boolean>(() => getDemoMode());
+
+	useEffect(() => {
+		applyDemoMode(demo);
+	}, [demo]);
+
+	function toggle() {
+		setDemo((d) => !d);
+	}
+
+	return { demo, toggle };
+}

packages/web/src/index.css

@@ -5,6 +5,23 @@
 @import "@fontsource/dm-sans/500.css";
 @import "@fontsource/dm-sans/600.css";
 
+/* Redacted font — loaded on demand for demo mode */
+@font-face {
+	font-family: "Redacted Script";
+	font-style: normal;
+	font-weight: 400;
+	font-display: swap;
+	src:
+		url("https://cdn.jsdelivr.net/gh/christiannaths/redacted-font@0.0.2/fonts/web/redacted-script-regular.woff2")
+		format("woff2"),
+		url("https://cdn.jsdelivr.net/gh/christiannaths/redacted-font@0.0.2/fonts/web/redacted-script-regular.woff")
+		format("woff");
+}
+
+[data-demo="true"] *:not(svg):not(path):not(circle):not(line):not(polyline):not(rect):not(polygon) {
+	font-family: "Redacted Script", cursive !important;
+}
+
 /* ─── Tailwind v4 theme bridge ─── */
 @theme inline {
 	--color-background: var(--bg);

packages/web/src/lib/demo.ts

@@ -0,0 +1,10 @@
+const DEMO_KEY = "openconcho:demo";
+
+export function getDemoMode(): boolean {
+	return localStorage.getItem(DEMO_KEY) === "true";
+}
+
+export function applyDemoMode(enabled: boolean): void {
+	document.documentElement.setAttribute("data-demo", String(enabled));
+	localStorage.setItem(DEMO_KEY, String(enabled));
+}

packages/web/src/main.tsx

@@ -2,9 +2,12 @@ import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import { createRouter, RouterProvider } from "@tanstack/react-router";
 import { StrictMode } from "react";
 import { createRoot } from "react-dom/client";
+import { applyDemoMode, getDemoMode } from "@/lib/demo";
 import { routeTree } from "./routeTree.gen";
 import "./index.css";
 
+applyDemoMode(getDemoMode());
+
 const queryClient = new QueryClient({
 	defaultOptions: {
 		queries: {