feat: team-based visibility, roles management, unified users, UI fixes

- Add Roles table with CRUD routes and Settings page management
- Unify user management: remove Users page, enhance Team page with
  permission level + role dropdowns
- Add team-based visibility scoping to projects, campaigns, posts,
  tasks, issues, artefacts, and dashboard
- Add team_id to projects and campaigns (create + edit forms)
- Add getUserTeamIds/getUserVisibilityContext helpers
- Fix Budgets modal horizontal scroll (separate linked-to row)
- Add collapsible filter bar to PostProduction page

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/src/pages/Settings.jsx

@@ -1,13 +1,22 @@
-import { useState, useEffect } from 'react'
-import { Settings as SettingsIcon, Play, CheckCircle, Languages, Coins, Upload } from 'lucide-react'
+import { useState, useEffect, useContext } from 'react'
+import { Settings as SettingsIcon, Play, CheckCircle, Languages, Coins, Upload, Tag, Plus, Pencil, Trash2, X } from 'lucide-react'
 import { api } from '../utils/api'
 import { useLanguage } from '../i18n/LanguageContext'
 import { useToast } from '../components/ToastContainer'
 import { CURRENCIES } from '../i18n/LanguageContext'
+import { AppContext } from '../App'
+import { useAuth } from '../contexts/AuthContext'
+
+const ROLE_COLORS = [
+  '#3B82F6', '#10B981', '#F59E0B', '#EF4444', '#8B5CF6',
+  '#EC4899', '#06B6D4', '#F97316', '#6366F1', '#14B8A6',
+]
 
 export default function Settings() {
   const { t, lang, setLang, currency, setCurrency } = useLanguage()
   const toast = useToast()
+  const { user } = useAuth()
+  const { roles, loadRoles } = useContext(AppContext)
   const [restarting, setRestarting] = useState(false)
   const [success, setSuccess] = useState(false)
   const [maxSizeMB, setMaxSizeMB] = useState(50)
@@ -176,6 +185,119 @@ export default function Settings() {
           )}
         </div>
       </div>
+
+      {/* Roles Management (Superadmin only) */}
+      {user?.role === 'superadmin' && <RolesSection roles={roles} loadRoles={loadRoles} t={t} toast={toast} />}
+    </div>
+  )
+}
+
+function RolesSection({ roles, loadRoles, t, toast }) {
+  const [editingRole, setEditingRole] = useState(null)
+  const [newRole, setNewRole] = useState(null)
+  const [saving, setSaving] = useState(false)
+
+  const handleSave = async (role) => {
+    setSaving(true)
+    try {
+      if (role.Id || role.id) {
+        await api.patch(`/roles/${role.Id || role.id}`, { name: role.name, color: role.color })
+      } else {
+        await api.post('/roles', { name: role.name, color: role.color })
+      }
+      await loadRoles()
+      setEditingRole(null)
+      setNewRole(null)
+    } catch (err) {
+      toast.error(err.message || t('common.error'))
+    } finally {
+      setSaving(false)
+    }
+  }
+
+  const handleDelete = async (role) => {
+    if (!confirm(t('settings.deleteRoleConfirm'))) return
+    try {
+      await api.delete(`/roles/${role.Id || role.id}`)
+      await loadRoles()
+    } catch (err) {
+      toast.error(err.message || t('common.error'))
+    }
+  }
+
+  return (
+    <div className="bg-white dark:bg-surface-primary rounded-xl border border-border overflow-hidden">
+      <div className="px-6 py-4 border-b border-border flex items-center justify-between">
+        <h2 className="text-lg font-semibold text-text-primary flex items-center gap-2">
+          <Tag className="w-5 h-5 text-brand-primary" />
+          {t('settings.roles')}
+        </h2>
+        <button
+          onClick={() => setNewRole({ name: '', color: ROLE_COLORS[roles.length % ROLE_COLORS.length] })}
+          className="flex items-center gap-1.5 px-3 py-1.5 text-sm font-medium bg-brand-primary text-white rounded-lg hover:bg-brand-primary-light transition-colors"
+        >
+          <Plus className="w-4 h-4" />
+          {t('settings.addRole')}
+        </button>
+      </div>
+      <div className="p-6">
+        <p className="text-sm text-text-tertiary mb-4">{t('settings.rolesDesc')}</p>
+        <div className="space-y-2">
+          {roles.map(role => (
+            <div key={role.Id || role.id} className="flex items-center gap-3 p-3 rounded-lg border border-border hover:bg-surface-secondary transition-colors">
+              {editingRole?.Id === role.Id ? (
+                <RoleForm role={editingRole} onChange={setEditingRole} onSave={() => handleSave(editingRole)} onCancel={() => setEditingRole(null)} saving={saving} t={t} />
+              ) : (
+                <>
+                  <div className="w-4 h-4 rounded-full shrink-0" style={{ backgroundColor: role.color || '#94A3B8' }} />
+                  <span className="flex-1 text-sm font-medium text-text-primary">{role.name}</span>
+                  <button onClick={() => setEditingRole({ ...role })} className="p-1.5 text-text-tertiary hover:text-brand-primary rounded-lg hover:bg-surface-tertiary transition-colors">
+                    <Pencil className="w-4 h-4" />
+                  </button>
+                  <button onClick={() => handleDelete(role)} className="p-1.5 text-text-tertiary hover:text-red-500 rounded-lg hover:bg-red-50 transition-colors">
+                    <Trash2 className="w-4 h-4" />
+                  </button>
+                </>
+              )}
+            </div>
+          ))}
+          {newRole && (
+            <div className="p-3 rounded-lg border-2 border-dashed border-brand-primary/30 bg-brand-primary/5">
+              <RoleForm role={newRole} onChange={setNewRole} onSave={() => handleSave(newRole)} onCancel={() => setNewRole(null)} saving={saving} t={t} />
+            </div>
+          )}
+          {roles.length === 0 && !newRole && (
+            <p className="text-sm text-text-tertiary text-center py-6">{t('settings.noRoles')}</p>
+          )}
+        </div>
+      </div>
+    </div>
+  )
+}
+
+function RoleForm({ role, onChange, onSave, onCancel, saving, t }) {
+  return (
+    <div className="flex items-center gap-3 flex-1">
+      <input
+        type="color"
+        value={role.color || '#94A3B8'}
+        onChange={e => onChange({ ...role, color: e.target.value })}
+        className="w-8 h-8 rounded-lg border border-border cursor-pointer"
+      />
+      <input
+        type="text"
+        value={role.name}
+        onChange={e => onChange({ ...role, name: e.target.value })}
+        placeholder={t('settings.roleName')}
+        className="flex-1 px-3 py-1.5 text-sm border border-border rounded-lg focus:outline-none focus:ring-2 focus:ring-brand-primary/20 focus:border-brand-primary"
+        autoFocus
+      />
+      <button onClick={onSave} disabled={!role.name || saving} className="px-3 py-1.5 text-sm font-medium bg-brand-primary text-white rounded-lg hover:bg-brand-primary-light disabled:opacity-50 transition-colors">
+        {saving ? '...' : t('common.save')}
+      </button>
+      <button onClick={onCancel} className="p-1.5 text-text-tertiary hover:text-text-primary rounded-lg hover:bg-surface-tertiary transition-colors">
+        <X className="w-4 h-4" />
+      </button>
     </div>
   )
 }