fix: handle invalid JSON response in facets query

Add validation for facets API response to prevent JSON parse errors
when the server returns unexpected data. Falls back to empty facets
and zero total when response is invalid.

Fixes #802

apps/web/components/memories-grid.tsx

@@ -156,7 +156,21 @@ export function MemoriesGrid({
 				throw new Error(response.error?.message || "Failed to fetch facets")
 			}
 
-			return response.data as FacetsResponse
+			// Validate response data to prevent JSON parse errors
+			const data = response.data as unknown
+			if (
+				data &&
+				typeof data === "object" &&
+				"facets" in data &&
+				Array.isArray(data.facets) &&
+				"total" in data &&
+				typeof data.total === "number"
+			) {
+				return data as FacetsResponse
+			}
+
+			// Return default values if response is invalid
+			return { facets: [], total: 0 }
 		},
 		staleTime: 5 * 60 * 1000,
 		enabled: !!user,