chore: initialize Next.js project baseline

components/ui/badge.tsx

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+import * as React from "react";
+import { cva, type VariantProps } from "class-variance-authority";
+
+import { cn } from "@/lib/utils";
+
+const badgeVariants = cva(
+  "inline-flex items-center rounded-md border px-2.5 py-1 text-xs font-medium transition-colors",
+  {
+    variants: {
+      variant: {
+        default: "border-transparent bg-primary text-primary-foreground",
+        secondary: "border-transparent bg-secondary text-secondary-foreground",
+        outline: "text-foreground",
+        success: "border-emerald-200 bg-emerald-50 text-emerald-700",
+        warning: "border-amber-200 bg-amber-50 text-amber-700",
+        danger: "border-red-200 bg-red-50 text-red-700",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+    },
+  },
+);
+
+export interface BadgeProps
+  extends React.HTMLAttributes<HTMLDivElement>,
+    VariantProps<typeof badgeVariants> {}
+
+export function Badge({ className, variant, ...props }: BadgeProps): React.ReactElement {
+  return <div className={cn(badgeVariants({ variant }), className)} {...props} />;
+}

components/ui/button.tsx

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+import * as React from "react";
+import { Slot } from "@radix-ui/react-slot";
+import { cva, type VariantProps } from "class-variance-authority";
+
+import { cn } from "@/lib/utils";
+
+const buttonVariants = cva(
+  "inline-flex min-h-11 shrink-0 items-center justify-center gap-2 rounded-md text-sm font-medium transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring disabled:pointer-events-none disabled:opacity-50 [&_svg]:size-4 [&_svg]:shrink-0",
+  {
+    variants: {
+      variant: {
+        default: "bg-primary text-primary-foreground hover:bg-primary/90",
+        secondary: "bg-secondary text-secondary-foreground hover:bg-secondary/80",
+        outline: "border bg-background hover:bg-accent hover:text-accent-foreground",
+        ghost: "hover:bg-accent hover:text-accent-foreground",
+        destructive: "bg-destructive text-destructive-foreground hover:bg-destructive/90",
+      },
+      size: {
+        default: "h-11 px-4 py-2",
+        sm: "h-9 min-h-9 px-3",
+        lg: "h-12 px-6",
+        icon: "h-11 w-11",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+      size: "default",
+    },
+  },
+);
+
+export interface ButtonProps
+  extends React.ButtonHTMLAttributes<HTMLButtonElement>,
+    VariantProps<typeof buttonVariants> {
+  asChild?: boolean;
+}
+
+export function Button({
+  className,
+  variant,
+  size,
+  asChild = false,
+  ...props
+}: ButtonProps): React.ReactElement {
+  const Comp = asChild ? Slot : "button";
+
+  return <Comp className={cn(buttonVariants({ variant, size, className }))} {...props} />;
+}
+
+export { buttonVariants };

components/ui/card.tsx

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+import * as React from "react";
+
+import { cn } from "@/lib/utils";
+
+export function Card({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement>): React.ReactElement {
+  return (
+    <div
+      className={cn("rounded-lg border bg-card text-card-foreground shadow-sm", className)}
+      {...props}
+    />
+  );
+}
+
+export function CardHeader({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement>): React.ReactElement {
+  return <div className={cn("flex flex-col gap-1.5 p-5", className)} {...props} />;
+}
+
+export function CardTitle({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLHeadingElement>): React.ReactElement {
+  return <h3 className={cn("text-base font-semibold leading-none", className)} {...props} />;
+}
+
+export function CardDescription({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLParagraphElement>): React.ReactElement {
+  return <p className={cn("text-sm text-muted-foreground", className)} {...props} />;
+}
+
+export function CardContent({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement>): React.ReactElement {
+  return <div className={cn("p-5 pt-0", className)} {...props} />;
+}

components/ui/input.tsx

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+import * as React from "react";
+
+import { cn } from "@/lib/utils";
+
+export type InputProps = React.InputHTMLAttributes<HTMLInputElement>;
+
+export function Input({ className, type, ...props }: InputProps): React.ReactElement {
+  return (
+    <input
+      type={type}
+      className={cn(
+        "flex h-11 w-full rounded-md border bg-background px-3 text-sm outline-none transition-colors placeholder:text-muted-foreground focus-visible:ring-2 focus-visible:ring-ring disabled:cursor-not-allowed disabled:opacity-50",
+        className,
+      )}
+      {...props}
+    />
+  );
+}