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/routes/workspaces.tsx

@@ -0,0 +1,6 @@
+import { createFileRoute } from "@tanstack/react-router";
+import { WorkspaceList } from "@/components/workspaces/WorkspaceList";
+
+export const Route = createFileRoute("/workspaces")({
+	component: WorkspaceList,
+});