fix(perf): prevent Canvas double-mount on /site redirect

HomePage used to mount the Canvas before its effect fired the redirect
to /site, then unmount it as soon as the route changed. That left the
WebGL context torn down mid-load with GLTF requests still in flight,
which on slow GPUs ended in a 'Context Lost' and a stuck 1 FPS render
once the user came back from /site. The fix is a synchronous cookie
check after all hooks: if the user has not visited /site today we
return null and let the redirect happen without ever creating a GL
context.

Also drops the GameMap 'lite map skipped' log from warn to info: it
is an expected lite-loading path, not a problem worth a yellow warning.

src/pages/page.tsx

@@ -19,17 +19,10 @@ import { hasSiteBeenVisitedToday } from "@/utils/cookies/siteVisitCookie";
 import { logger } from "@/utils/core/Logger";
 import { World } from "@/world/World";
 
-export function HomePage(): React.JSX.Element {
+export function HomePage(): React.JSX.Element | null {
   const navigate = useNavigate();
   const introStep = useGameStore((state) => state.intro.currentStep);
   const setIntroStep = useGameStore((state) => state.setIntroStep);
-
-  useEffect(() => {
-    if (!hasSiteBeenVisitedToday()) {
-      navigate({ to: "/site", replace: true });
-    }
-  }, [navigate]);
-
   const dialogMessage = useGameStore(
     (state) => state.missionFlow.dialogMessage,
   );
@@ -38,6 +31,12 @@ export function HomePage(): React.JSX.Element {
     INITIAL_SCENE_LOADING_STATE,
   );
 
+  useEffect(() => {
+    if (!hasSiteBeenVisitedToday()) {
+      navigate({ to: "/site", replace: true });
+    }
+  }, [navigate]);
+
   useEffect(() => {
     if (!dialogMessage) return undefined;
 
@@ -98,6 +97,13 @@ export function HomePage(): React.JSX.Element {
     [],
   );
 
+  // Don't mount the Canvas until we know we will not redirect to /site.
+  // Without this guard the Canvas would mount, the effect above would fire
+  // navigate, and the Canvas would unmount mid-load — leaking GLTF requests
+  // and a WebGL context. The synchronous cookie check happens here AFTER
+  // all hooks (rules of hooks) but BEFORE any expensive render.
+  if (!hasSiteBeenVisitedToday()) return null;
+
   const renderIntroOverlay = () => {
     switch (introStep) {
       case "video":