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)

client/update-inputs.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+# Script to add dir="auto" to all input and textarea elements
+# This enables automatic RTL/LTR detection for mixed content
+
+find ./src -name "*.jsx" -type f -exec sed -i 's/<input\([^>]*\)\(type="text"\|type="email"\|type="url"\|type="search"\)\([^>]*\)>/<input\1\2\3 dir="auto">/g' {} \;
+find ./src -name "*.jsx" -type f -exec sed -i 's/<textarea\([^>]*\)>/<textarea\1 dir="auto">/g' {} \;
+
+echo "Updated all text inputs and textareas with dir='auto'"