Clean up unused imports and refactor type definitions

- Remove unused `cn` import from theme-selector - Remove unused `Slot`
import from badge - Remove unused `X` icon import from switch - Replace
empty interface extends with type alias in input - Replace empty
interface extends with type alias in textarea - Add "secondary" variant
to button type props - Replace "brand" variant with "default" in
client-list and invoice cards

src/components/ui/badge.tsx

@@ -1,5 +1,4 @@
 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";

src/components/ui/input.tsx

@@ -1,8 +1,7 @@
 import { cn } from "~/lib/utils";
 import * as React from "react";
 
-export interface InputProps
-  extends React.InputHTMLAttributes<HTMLInputElement> {}
+export type InputProps = React.InputHTMLAttributes<HTMLInputElement>;
 
 const Input = React.forwardRef<HTMLInputElement, InputProps>(
   ({ className, type, ...props }, ref) => {

src/components/ui/switch.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 import * as SwitchPrimitive from "@radix-ui/react-switch";
-import { Check, X } from "lucide-react";
+import { Check } from "lucide-react";
 import * as React from "react";
 import { cn } from "~/lib/utils";
 

src/components/ui/textarea.tsx

@@ -2,8 +2,7 @@ import * as React from "react";
 
 import { cn } from "~/lib/utils";
 
-export interface TextareaProps
-  extends React.TextareaHTMLAttributes<HTMLTextAreaElement> {}
+export type TextareaProps = React.TextareaHTMLAttributes<HTMLTextAreaElement>;
 
 const Textarea = React.forwardRef<HTMLTextAreaElement, TextareaProps>(
   ({ className, ...props }, ref) => {