Revert "Unify workspace dropdowns; Update layouts (#458)"

This reverts commit 4bc8448a1d.

apps/web/app/home/(user)/_lib/server/load-user-workspace.ts

@@ -0,0 +1,82 @@
+import { cache } from 'react';
+
+import { redirect } from 'next/navigation';
+
+import { createAccountsApi } from '@kit/accounts/api';
+import { getSupabaseServerClient } from '@kit/supabase/server-client';
+import { createAccountCreationPolicyEvaluator } from '@kit/team-accounts/policies';
+
+import featureFlagsConfig from '~/config/feature-flags.config';
+import { requireUserInServerComponent } from '~/lib/server/require-user-in-server-component';
+
+const shouldLoadAccounts = featureFlagsConfig.enableTeamAccounts;
+
+export type UserWorkspace = Awaited<ReturnType<typeof loadUserWorkspace>>;
+
+/**
+ * @name loadUserWorkspace
+ * @description
+ * Load the user workspace data. It's a cached per-request function that fetches the user workspace data.
+ * It can be used across the server components to load the user workspace data.
+ */
+export const loadUserWorkspace = cache(workspaceLoader);
+
+async function workspaceLoader() {
+  const client = getSupabaseServerClient();
+  const api = createAccountsApi(client);
+
+  const accountsPromise = shouldLoadAccounts
+    ? () => api.loadUserAccounts()
+    : () => Promise.resolve([]);
+
+  const workspacePromise = api.getAccountWorkspace();
+
+  const [accounts, workspace, user] = await Promise.all([
+    accountsPromise(),
+    workspacePromise,
+    requireUserInServerComponent(),
+  ]);
+
+  // If the user is not found or the workspace is not found, redirect to the home page - this may happen if the JWT is invalid or expired (ex. user deleted?)
+  if (!workspace || !user) {
+    redirect('/');
+  }
+
+  // Check if user can create team accounts (policy check)
+  const canCreateTeamAccount = shouldLoadAccounts
+    ? await checkCanCreateTeamAccount(user.id)
+    : { allowed: false, reason: undefined };
+
+  return {
+    accounts,
+    workspace,
+    user,
+    canCreateTeamAccount,
+  };
+}
+
+/**
+ * Check if the user can create a team account based on policies.
+ * Preliminary checks run without account name - name validation happens during submission.
+ */
+async function checkCanCreateTeamAccount(userId: string) {
+  const evaluator = createAccountCreationPolicyEvaluator();
+  const hasPolicies = await evaluator.hasPoliciesForStage('preliminary');
+
+  if (!hasPolicies) {
+    return { allowed: true, reason: undefined };
+  }
+
+  const context = {
+    timestamp: new Date().toISOString(),
+    userId,
+    accountName: '',
+  };
+
+  const result = await evaluator.canCreateAccount(context, 'preliminary');
+
+  return {
+    allowed: result.allowed,
+    reason: result.reasons[0],
+  };
+}