Add Inicio dashboard as homepage

Stat cards (gasto del ciclo, próximas cuotas Tasa Cero, pensión),
ask-the-assistant box that lands in Asistente and auto-sends via
agent.addMessage + runAgent, and últimas transacciones. Index route,
login redirects updated; Asistente stays at /asistente.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/src/pages/Asistente.tsx

@@ -1,4 +1,11 @@
-import { CopilotChat, useConfigureSuggestions } from "@copilotkit/react-core/v2";
+import { useEffect, useRef } from "react";
+import { useLocation, useNavigate } from "react-router-dom";
+import {
+  CopilotChat,
+  useAgent,
+  useConfigureSuggestions,
+  useCopilotKit,
+} from "@copilotkit/react-core/v2";
 import { useCopilotAction } from "@copilotkit/react-core";
 import { Sparkles } from "lucide-react";
 import { SpendingSummaryCard, type SpendingSummaryArgs } from "@/components/chat/ChatCards";
@@ -16,6 +23,28 @@ const STATIC_SUGGESTIONS = {
 export default function Asistente() {
   useConfigureSuggestions(STATIC_SUGGESTIONS);
 
+  // A question typed on the Inicio dashboard arrives via router state:
+  // append it as a user message and run the agent once.
+  const location = useLocation();
+  const navigate = useNavigate();
+  const { agent } = useAgent();
+  const { copilotkit } = useCopilotKit();
+  const sentRef = useRef(false);
+  useEffect(() => {
+    const ask = (location.state as { ask?: string } | null)?.ask;
+    if (!ask || sentRef.current || !agent) return;
+    sentRef.current = true;
+    // Clear the state so back/refresh doesn't re-send the question.
+    navigate(location.pathname, { replace: true, state: null });
+    agent.addMessage({
+      id: crypto.randomUUID(),
+      role: "user",
+      content: ask,
+    });
+    void copilotkit.runAgent({ agent });
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [agent]);
+
   useCopilotAction({
     name: "render_spending_summary",
     description: