Marketing Hub: RBAC, i18n (AR/EN), tasks overhaul, team/user merge, tutorial

Features:
- Full RBAC with 3 roles (superadmin/manager/contributor)
- Ownership tracking on posts, tasks, campaigns, projects
- Task system: assign to anyone, filter combobox, visibility scoping
- Team members merged into users table (single source of truth)
- Post thumbnails on kanban cards from attachments
- Publication link validation before publishing
- Interactive onboarding tutorial with Settings restart
- Full Arabic/English i18n with RTL layout support
- Language toggle in sidebar, IBM Plex Sans Arabic font
- Brand-based visibility filtering for non-superadmins
- Manager can only create contributors
- Profile completion flow for new users
- Cookie-based sessions (express-session + SQLite)

server/node_modules/@npmcli/fs/lib/write-file.js

@@ -0,0 +1,19 @@
+const fs = require('./fs.js')
+const getOptions = require('./common/get-options.js')
+const owner = require('./common/owner.js')
+
+const writeFile = async (file, data, opts) => {
+  const options = getOptions(opts, {
+    copy: ['encoding', 'mode', 'flag', 'signal', 'owner'],
+    wrap: 'encoding',
+  })
+  const { uid, gid } = await owner.validate(file, options.owner)
+
+  const result = await fs.writeFile(file, data, options)
+
+  await owner.update(file, uid, gid)
+
+  return result
+}
+
+module.exports = writeFile