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/file-uri-to-path/test/tests.json

@@ -0,0 +1,13 @@
+{
+  "file://host/path": "\\\\host\\path",
+  "file://localhost/etc/fstab": "\\etc\\fstab",
+  "file:///etc/fstab": "\\etc\\fstab",
+  "file:///c:/WINDOWS/clock.avi": "c:\\WINDOWS\\clock.avi",
+  "file://localhost/c|/WINDOWS/clock.avi": "c:\\WINDOWS\\clock.avi",
+  "file:///c|/WINDOWS/clock.avi": "c:\\WINDOWS\\clock.avi",
+  "file://localhost/c:/WINDOWS/clock.avi": "c:\\WINDOWS\\clock.avi",
+  "file://hostname/path/to/the%20file.txt": "\\\\hostname\\path\\to\\the file.txt",
+  "file:///c:/path/to/the%20file.txt": "c:\\path\\to\\the file.txt",
+  "file:///C:/Documents%20and%20Settings/davris/FileSchemeURIs.doc": "C:\\Documents and Settings\\davris\\FileSchemeURIs.doc",
+  "file:///C:/caf%C3%A9/%C3%A5r/d%C3%BCnn/%E7%89%9B%E9%93%83/Ph%E1%BB%9F/%F0%9F%98%B5.exe": "C:\\café\\år\\dünn\\牛铃\\Phở\\😵.exe"
+}