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/minipass-fetch/lib/fetch-error.js

@@ -0,0 +1,31 @@
+'use strict'
+class FetchError extends Error {
+  constructor (message, type, systemError) {
+    super(message)
+    this.code = 'FETCH_ERROR'
+
+    // pick up code, expected, path, ...
+    if (systemError)
+      Object.assign(this, systemError)
+
+    this.errno = this.code
+
+    // override anything the system error might've clobbered
+    this.type = this.code === 'EBADSIZE' && this.found > this.expect
+      ? 'max-size' : type
+    this.message = message
+    Error.captureStackTrace(this, this.constructor)
+  }
+
+  get name () {
+    return 'FetchError'
+  }
+
+  // don't allow name to be overwritten
+  set name (n) {}
+
+  get [Symbol.toStringTag] () {
+    return 'FetchError'
+  }
+}
+module.exports = FetchError