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/merge-descriptors/HISTORY.md

@@ -0,0 +1,21 @@
+1.0.1 / 2016-01-17
+==================
+
+  * perf: enable strict mode
+
+1.0.0 / 2015-03-01
+==================
+
+  * Add option to only add new descriptors
+  * Add simple argument validation
+  * Add jsdoc to source file
+
+0.0.2 / 2013-12-14
+==================
+
+  * Move repository to `component` organization
+
+0.0.1 / 2013-10-29
+==================
+
+  * Initial release