feat(inbox): add Caixa de Entrada page for managing companion notifications

- Create inbox page with pending items management:
  - InboxCard: displays notification summary with parsed data
  - InboxDetailsDialog: view full notification details
  - ProcessDialog: convert notification to transaction (lancamento)

- Add server actions for inbox operations:
  - getInboxItems: fetch pending inbox items
  - processInboxItem: create lancamento from inbox item
  - discardInboxItem: discard unwanted notifications

- Add navigation link to sidebar under 'Gestão Financeira'
- Add revalidation config for inbox-related paths

app/(dashboard)/caixa-de-entrada/page.tsx

@@ -0,0 +1,30 @@
+import { InboxPage } from "@/components/caixa-de-entrada/inbox-page";
+import { getUserId } from "@/lib/auth/server";
+import {
+  fetchInboxItems,
+  fetchCategoriasForSelect,
+  fetchContasForSelect,
+  fetchCartoesForSelect,
+} from "./data";
+
+export default async function Page() {
+  const userId = await getUserId();
+
+  const [items, categorias, contas, cartoes] = await Promise.all([
+    fetchInboxItems(userId, "pending"),
+    fetchCategoriasForSelect(userId),
+    fetchContasForSelect(userId),
+    fetchCartoesForSelect(userId),
+  ]);
+
+  return (
+    <main className="flex flex-col items-start gap-6">
+      <InboxPage
+        items={items}
+        categorias={categorias}
+        contas={contas}
+        cartoes={cartoes}
+      />
+    </main>
+  );
+}