fix(scope): all pages react to company scope change via useScopeEffect

- Created useScopeEffect hook that auto-triggers reload on scope change
- Replaced useEffect([], []) with useScopeEffect in 20+ pages
- Risks/Reports/Dashboard also use useScopeEffect
- Removed redundant per-page useCompanyScope where only effect was needed

frontend/src/app/(investor)/agents/page.tsx

@@ -1,6 +1,7 @@
 "use client";
 
-import { useEffect, useState } from "react";
+import { useState } from "react";
+import { useScopeEffect } from "@/lib/company-scope";
 import { listAgentExecutions, reviewAgentExecution } from "@/lib/api-v2";
 import { PageContainer, Badge} from "@/components/shared/PageContainer";
 import { LoadingSpinner } from "@/components/shared/LoadingSpinner";
@@ -28,7 +29,7 @@ export default function AgentsPage() {
       .finally(() => setIsLoading(false));
   };
 
-  useEffect(() => { load(); }, []);
+  useScopeEffect(() => { load(); });
 
   const handleReview = async (id: string, status: string) => {
     try {