fix: add browserHttpEndpoint for client-side Apollo requests

The Apollo Client was using httpEndpoint (http://localhost:3000/api/graphql)
for browser requests, which fails on remote servers. Added browserHttpEndpoint
as relative URL "/api/graphql" so browser requests go to the correct origin.
Also added error logging to setInboxHidden mutation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/app/components/workspace/CrmWorkspaceApp.vue

@@ -4367,6 +4367,8 @@ async function setInboxHidden(inboxId: string, hidden: boolean) {
   inboxToggleLoadingById.value = { ...inboxToggleLoadingById.value, [id]: true };
   try {
     await doSetContactInboxHidden({ inboxId: id, hidden });
+  } catch (e: unknown) {
+    console.error("[setInboxHidden] mutation failed:", e);
   } finally {
     inboxToggleLoadingById.value = { ...inboxToggleLoadingById.value, [id]: false };
   }

frontend/nuxt.config.ts

@@ -26,6 +26,7 @@ export default defineNuxtConfig({
     clients: {
       default: {
         httpEndpoint: process.env.GRAPHQL_HTTP_ENDPOINT || "http://localhost:3000/api/graphql",
+        browserHttpEndpoint: "/api/graphql",
         connectToDevTools: process.dev,
         httpLinkOptions: {
           credentials: "include",