feat: initial Honcho UI scaffold

React 19 + Vite 8 + TanStack Router SPA for browsing and chatting with
a self-hosted Honcho instance. Configurable base URL stored in localStorage
only. Dark/light theme, framer-motion animations, lucide-react icons.

src/lib/config.ts

@@ -0,0 +1,60 @@
+import { z } from "zod";
+
+const CONFIG_KEY = "honcho-ui:config";
+
+export const configSchema = z.object({
+	baseUrl: z.string().url("Must be a valid URL"),
+	token: z.string().optional().default(""),
+});
+
+export type Config = z.infer<typeof configSchema>;
+
+export function loadConfig(): Config | null {
+	try {
+		const raw = localStorage.getItem(CONFIG_KEY);
+		if (!raw) return null;
+		const parsed = JSON.parse(raw);
+		return configSchema.parse(parsed);
+	} catch {
+		return null;
+	}
+}
+
+export function saveConfig(config: Config): void {
+	localStorage.setItem(CONFIG_KEY, JSON.stringify(config));
+}
+
+export function clearConfig(): void {
+	localStorage.removeItem(CONFIG_KEY);
+}
+
+export type HealthStatus = "ok" | "auth-required" | "unreachable" | "checking";
+
+export async function checkConnection(baseUrl: string, token?: string): Promise<{
+	status: HealthStatus;
+	message: string;
+}> {
+	try {
+		const headers: Record<string, string> = { "Content-Type": "application/json" };
+		if (token) headers["Authorization"] = `Bearer ${token}`;
+
+		const res = await fetch(`${baseUrl}/v3/workspaces/list`, {
+			method: "POST",
+			headers,
+			body: JSON.stringify({}),
+			signal: AbortSignal.timeout(5000),
+		});
+
+		if (res.ok) return { status: "ok", message: "Connected successfully" };
+		if (res.status === 401 || res.status === 403) {
+			return { status: "auth-required", message: "Authentication required — provide an API token" };
+		}
+		return { status: "unreachable", message: `Server returned ${res.status}` };
+	} catch (err) {
+		const msg = err instanceof Error ? err.message : "Unknown error";
+		if (msg.includes("AbortError") || msg.includes("timeout")) {
+			return { status: "unreachable", message: "Connection timed out" };
+		}
+		return { status: "unreachable", message: `Cannot reach server: ${msg}` };
+	}
+}