fix: hide the global AI chat widget on /coming-soon

AiChatWidget renders unconditionally in the root layout for every
route - looked out of place on the pre-launch marketing page (a
floating chat bubble implying app functionality that doesn't exist
yet). Hidden via a small route-exclusion set keyed off useLocation(),
rather than threading a prop through every route.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app.tsx

@@ -1,15 +1,22 @@
 import { MetaProvider, Title } from "@solidjs/meta";
-import { Router } from "@solidjs/router";
+import { Router, useLocation } from "@solidjs/router";
 import { FileRoutes } from "@solidjs/start/router";
-import { ErrorBoundary, Suspense } from "solid-js";
+import { ErrorBoundary, Suspense, Show } from "solid-js";
 import { AuthProvider } from "~/lib/auth";
 import { AiChatWidget } from "~/components/AiChatWidget";
 import "./app.css";
 
+// Standalone pre-launch pages that shouldn't show the logged-out-app chrome
+// (the AI chat widget assumes an app context - it doesn't make sense on a
+// pure marketing/waitlist page).
+const NO_CHAT_WIDGET_ROUTES = new Set(["/coming-soon"]);
+
 export default function App() {
   return (
     <Router
-      root={(props) => (
+      root={(props) => {
+        const location = useLocation();
+        return (
           <MetaProvider>
             <Title>Nxtgauge</Title>
             <AuthProvider>
@@ -42,11 +49,14 @@ export default function App() {
                 )}
               >
                 <Suspense>{props.children}</Suspense>
+                <Show when={!NO_CHAT_WIDGET_ROUTES.has(location.pathname)}>
                   <AiChatWidget />
+                </Show>
               </ErrorBoundary>
             </AuthProvider>
           </MetaProvider>
-      )}
+        );
+      }}
     >
       <FileRoutes />
     </Router>