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/badge.tsx

@@ -0,0 +1,38 @@
+import * as React from "react";
+import { cva, type VariantProps } from "class-variance-authority";
+
+import { cn } from "@/lib/utils/styles";
+
+const badgeVariants = cva(
+  "inline-flex items-center rounded-full border px-2.5 py-0.5 text-xs font-semibold transition-colors focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2",
+  {
+    variants: {
+      variant: {
+        default: "border-transparent bg-primary text-primary-foreground hover:bg-primary/80",
+        secondary: "border-transparent bg-secondary text-secondary-foreground hover:bg-secondary/80",
+        destructive: "border-transparent bg-destructive text-destructive-foreground hover:bg-destructive/80",
+        outline: "text-foreground",
+        paid: "border-transparent bg-emerald-500 text-emerald-50",
+        unpaid: "border-transparent bg-amber-500 text-amber-50",
+        shipped: "border-transparent bg-blue-500 text-blue-50",
+        completed: "border-transparent bg-purple-500 text-purple-50",
+        pending: "border-transparent bg-orange-500 text-orange-50"
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+    },
+  }
+);
+
+export interface BadgeProps
+  extends React.HTMLAttributes<HTMLDivElement>,
+    VariantProps<typeof badgeVariants> {}
+
+function Badge({ className, variant, ...props }: BadgeProps) {
+  return (
+    <div className={cn(badgeVariants({ variant }), className)} {...props} />
+  );
+}
+
+export { Badge, badgeVariants };