reset mobile context caches on user identity changes

apps/mobile/src/contexts/RecommendationsContext.tsx

@@ -3,6 +3,7 @@ import React, {
   useContext,
   useState,
   useCallback,
+  useEffect,
   useRef,
 } from "react";
 import { useUser, useAuth } from "@clerk/clerk-expo";
@@ -108,12 +109,22 @@ export function RecommendationsProvider({
 
   const clearCache = useCallback(() => {
     setRecommendations([]);
+    setLoading(false);
     setLastFetchTime(0);
     setError(null);
     fetchInProgress.current = false;
     log.debug("Recommendations cache cleared");
   }, []);
 
+  useEffect(() => {
+    clearCache();
+    if (user?.id) {
+      log.debug("Recommendations cache reset for user", { userId: user.id });
+    } else {
+      log.debug("Recommendations cache reset on sign-out");
+    }
+  }, [user?.id, clearCache]);
+
   return (
     <RecommendationsContext.Provider
       value={{