Refactor UI imports and update component paths

Replaces imports from 'components/ui' with 'components/common' across the app and dashboard pages, and updates model and API imports to use new paths under 'lib'. Removes redundant authentication checks from several dashboard pages. Adds new dashboard components and utility files, and reorganizes hooks and services into the 'lib' directory for improved structure.

components/common/empty-state.tsx

@@ -0,0 +1,139 @@
+"use client"
+
+import * as React from "react"
+import { Button } from "@/components/common/button"
+import {
+    Package,
+    ShoppingBag,
+    Users,
+    Truck,
+    MessageCircle,
+    Plus,
+    Share2,
+    LucideIcon
+} from "lucide-react"
+import Link from "next/link"
+
+interface EmptyStateProps {
+    icon?: LucideIcon
+    title: string
+    description: string
+    actionLabel?: string
+    actionHref?: string
+    actionOnClick?: () => void
+    secondaryActionLabel?: string
+    secondaryActionHref?: string
+    className?: string
+}
+
+/**
+ * EmptyState - Reusable component for empty tables/lists
+ * Shows an icon, title, description, and optional action button
+ */
+export function EmptyState({
+    icon: Icon = Package,
+    title,
+    description,
+    actionLabel,
+    actionHref,
+    actionOnClick,
+    secondaryActionLabel,
+    secondaryActionHref,
+    className = ""
+}: EmptyStateProps) {
+    return (
+        <div className={`flex flex-col items-center justify-center py-12 px-4 text-center ${className}`}>
+            <div className="h-16 w-16 rounded-full bg-muted/50 flex items-center justify-center mb-4">
+                <Icon className="h-8 w-8 text-muted-foreground/50" />
+            </div>
+            <h3 className="text-lg font-medium mb-2">{title}</h3>
+            <p className="text-sm text-muted-foreground max-w-sm mb-6">{description}</p>
+            <div className="flex items-center gap-3">
+                {actionLabel && (
+                    actionHref ? (
+                        <Button asChild>
+                            <Link href={actionHref}>
+                                <Plus className="h-4 w-4 mr-2" />
+                                {actionLabel}
+                            </Link>
+                        </Button>
+                    ) : actionOnClick ? (
+                        <Button onClick={actionOnClick}>
+                            <Plus className="h-4 w-4 mr-2" />
+                            {actionLabel}
+                        </Button>
+                    ) : null
+                )}
+                {secondaryActionLabel && secondaryActionHref && (
+                    <Button variant="outline" asChild>
+                        <Link href={secondaryActionHref}>
+                            <Share2 className="h-4 w-4 mr-2" />
+                            {secondaryActionLabel}
+                        </Link>
+                    </Button>
+                )}
+            </div>
+        </div>
+    )
+}
+
+// Preset empty states for common scenarios
+export function OrdersEmptyState() {
+    return (
+        <EmptyState
+            icon={ShoppingBag}
+            title="No orders yet"
+            description="When customers place orders, they'll appear here. Share your store link to start selling!"
+            secondaryActionLabel="Share Store"
+            secondaryActionHref="/dashboard/storefront"
+        />
+    )
+}
+
+export function ProductsEmptyState({ onAddProduct }: { onAddProduct?: () => void }) {
+    return (
+        <EmptyState
+            icon={Package}
+            title="No products yet"
+            description="Add your first product to start selling. You can add products manually or import from a file."
+            actionLabel="Add Product"
+            actionOnClick={onAddProduct}
+            actionHref={onAddProduct ? undefined : "/dashboard/products/add"}
+        />
+    )
+}
+
+export function CustomersEmptyState() {
+    return (
+        <EmptyState
+            icon={Users}
+            title="No customers yet"
+            description="Once customers interact with your store, they'll appear here. Share your store link to attract customers!"
+            secondaryActionLabel="Share Store"
+            secondaryActionHref="/dashboard/storefront"
+        />
+    )
+}
+
+export function ShippingEmptyState({ onAddMethod }: { onAddMethod?: () => void }) {
+    return (
+        <EmptyState
+            icon={Truck}
+            title="No shipping methods"
+            description="Add shipping methods so customers know how they'll receive their orders."
+            actionLabel="Add Shipping Method"
+            actionOnClick={onAddMethod}
+        />
+    )
+}
+
+export function ChatsEmptyState() {
+    return (
+        <EmptyState
+            icon={MessageCircle}
+            title="No conversations yet"
+            description="Customer chats will appear here when they message you through Telegram."
+        />
+    )
+}
+