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/better-sqlite3/binding.gyp

@@ -0,0 +1,38 @@
+# ===
+# This is the main GYP file, which builds better-sqlite3 with SQLite itself.
+# ===
+
+{
+  'includes': ['deps/common.gypi'],
+  'targets': [
+    {
+      'target_name': 'better_sqlite3',
+      'dependencies': ['deps/sqlite3.gyp:sqlite3'],
+      'sources': ['src/better_sqlite3.cpp'],
+      'cflags_cc': ['-std=c++20'],
+      'xcode_settings': {
+        'OTHER_CPLUSPLUSFLAGS': ['-std=c++20', '-stdlib=libc++'],
+      },
+      'msvs_settings': {
+        'VCCLCompilerTool': {
+          'AdditionalOptions': [
+            '/std:c++20',
+          ],
+        },
+      },
+      'conditions': [
+        ['OS=="linux"', {
+          'ldflags': [
+            '-Wl,-Bsymbolic',
+            '-Wl,--exclude-libs,ALL',
+          ],
+        }],
+      ],
+    },
+    {
+      'target_name': 'test_extension',
+      'dependencies': ['deps/sqlite3.gyp:sqlite3'],
+      'conditions': [['sqlite3 == ""', { 'sources': ['deps/test_extension.c'] }]],
+    },
+  ],
+}