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/components/layout/sidebar.tsx

@@ -21,6 +21,9 @@ import {
   Bot,
   Facebook,
   Calendar,
+  FolderKanban,
+  FileText,
+  Clock,
 } from "lucide-react"
 
 import { useUser } from "@/providers/user-provider"
@@ -30,8 +33,11 @@ import { FacebookAccountsDialog } from "@/components/settings/facebook-accounts-
 const navItems = [
   { href: "/dashboard", label: "Dashboard", icon: LayoutDashboard },
   { href: "/leads", label: "Leads", icon: Users },
+  { href: "/projects", label: "Projects", icon: FolderKanban },
   { href: "/calendar", label: "Calendar", icon: Calendar },
   { href: "/chats", label: "Chats", icon: MessageSquare },
+  { href: "/proposals", label: "Proposals", icon: FileText },
+  { href: "/time-tracking", label: "Time", icon: Clock },
   { href: "/ai-assistant", label: "AI Assistant", icon: Bot, roles: ["sales", "admin", "super_admin"] },
   { href: "/users", label: "Users", icon: Building2 },
   { href: "/settings", label: "Settings", icon: Settings },