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/err-code/bower.json

@@ -0,0 +1,30 @@
+{
+  "name": "err-code",
+  "version": "1.1.1",
+  "description": "Create new error instances with a code and additional properties",
+  "main": "index.umd.js",
+  "homepage": "https://github.com/IndigoUnited/js-err-code",
+  "authors": [
+    "IndigoUnited <hello@indigounited.com> (http://indigounited.com)"
+  ],
+  "moduleType": [
+    "amd",
+    "globals",
+    "node"
+  ],
+  "keywords": [
+      "error",
+      "err",
+      "code",
+      "properties",
+      "property"
+  ],
+  "license": "MIT",
+  "ignore": [
+    "**/.*",
+    "node_modules",
+    "bower_components",
+    "test",
+    "tests"
+  ]
+}