Kanban board, Project Management, Proposals/Quotes, Time Tracking, Custom Fields

- Kanban board with drag-and-drop per stage, colour-coded cards, score bars
- Project Management with milestones, Gantt timeline, inline add milestone/task
- Proposal/Quote builder with line items, VAT, terms, e-signature capture
- Time Tracking with stopwatch, manual entry, hours-by-project chart
- Custom Fields system: admin-defined fields per entity (leads/customers/
  projects/opportunities) with drag-and-drop reordering in settings
- Reusable CustomFieldsSection component for entity detail pages
- Customers API endpoint
- All builds pass with zero errors

src/app/(dashboard)/settings/page.tsx

@@ -6,7 +6,8 @@ import { CompanySettingsForm } from "@/components/settings/company-settings-form
 import { UserPreferencesForm } from "@/components/settings/user-preferences-form"
 import { ThemeSettings } from "@/components/settings/theme-settings"
 import { NotificationSettings } from "@/components/settings/notification-settings"
-import { Building2, User, Palette, Bell } from "lucide-react"
+import { CustomFieldsManager } from "@/components/settings/custom-fields-manager"
+import { Building2, User, Palette, Bell, ListChecks } from "lucide-react"
 
 export default function SettingsPage() {
   const tabs = [
@@ -14,6 +15,7 @@ export default function SettingsPage() {
     { value: "preferences", label: "Preferences", icon: User, component: UserPreferencesForm },
     { value: "theme", label: "Theme", icon: Palette, component: ThemeSettings },
     { value: "notifications", label: "Notifications", icon: Bell, component: NotificationSettings },
+    { value: "custom-fields", label: "Custom Fields", icon: ListChecks, component: CustomFieldsManager },
   ]
 
   return (