add switch and checkbox components

src/lib/components/ui/checkbox/Checkbox.svelte

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+<!-- Checkbox Component -->
+<script lang="ts">
+	import { Checkbox as CheckboxPrimitive } from 'bits-ui';
+	import { Check, Minus } from 'lucide-svelte';
+	import { cn } from '$lib/utils.js';
+	import styles from './checkbox.module.scss';
+	import type { HTMLButtonAttributes } from 'svelte/elements';
+
+	interface Props extends Omit<HTMLButtonAttributes, 'value'> {
+		checked?: boolean | 'indeterminate';
+		disabled?: boolean;
+		required?: boolean;
+		name?: string;
+		value?: string;
+		onCheckedChange?: (checked: boolean | 'indeterminate') => void;
+		class?: string;
+		variant?: 'default' | 'bound';
+		size?: 'small' | 'medium' | 'large';
+	}
+
+	let {
+		checked = $bindable(false),
+		disabled = false,
+		required = false,
+		name,
+		value,
+		onCheckedChange,
+		class: className,
+		variant = 'default',
+		size = 'medium',
+		...restProps
+	}: Props = $props();
+
+	$: if (onCheckedChange && checked !== undefined) {
+		onCheckedChange(checked);
+	}
+
+	const sizeClasses = {
+		small: styles.small,
+		medium: styles.medium,
+		large: styles.large
+	};
+
+	const variantClasses = {
+		default: '',
+		bound: styles.bound
+	};
+</script>
+
+<CheckboxPrimitive.Root
+	bind:checked
+	{disabled}
+	{required}
+	{name}
+	{value}
+	class={cn(
+		styles.checkbox,
+		sizeClasses[size],
+		variantClasses[variant],
+		className
+	)}
+	{...restProps}
+>
+	<CheckboxPrimitive.Indicator class={styles.indicator}>
+		{#if checked === 'indeterminate'}
+			<Minus class={styles.icon} />
+		{:else}
+			<Check class={styles.icon} />
+		{/if}
+	</CheckboxPrimitive.Indicator>
+</CheckboxPrimitive.Root>

src/lib/components/ui/checkbox/checkbox.module.scss

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+@use 'themes/spacing';
+@use 'themes/colors';
+@use 'themes/layout';
+@use 'themes/typography';
+
+.checkbox {
+  background-color: var(--input-bg);
+  border: 2px solid var(--separator-bg);
+  border-radius: layout.$item-corner-small;
+  cursor: pointer;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  transition: all 0.18s ease-out;
+
+  &:hover:not(:disabled) {
+    background-color: var(--input-bg-hover);
+    border-color: var(--separator-bg-hover);
+  }
+
+  &:focus,
+  &:focus-visible {
+    outline: none;
+    border-color: colors.$blue;
+    box-shadow: 0 0 0 2px rgba(colors.$blue, 0.2);
+  }
+
+  &[data-state='checked'],
+  &[data-state='indeterminate'] {
+    background-color: var(--accent-blue);
+    border-color: var(--accent-blue);
+
+    &:hover:not(:disabled) {
+      background-color: var(--accent-blue-hover);
+      border-color: var(--accent-blue-hover);
+    }
+  }
+
+  &:disabled {
+    cursor: not-allowed;
+    opacity: 0.5;
+  }
+
+  &.bound {
+    background-color: var(--input-bound-bg);
+
+    &:hover:not(:disabled) {
+      background-color: var(--input-bound-bg-hover);
+    }
+
+    &[data-state='checked'],
+    &[data-state='indeterminate'] {
+      background-color: var(--accent-blue);
+      border-color: var(--accent-blue);
+    }
+  }
+}
+
+// Size variations
+.small {
+  width: 16px;
+  height: 16px;
+
+  .icon {
+    width: 12px;
+    height: 12px;
+  }
+}
+
+.medium {
+  width: 20px;
+  height: 20px;
+
+  .icon {
+    width: 14px;
+    height: 14px;
+  }
+}
+
+.large {
+  width: 24px;
+  height: 24px;
+
+  .icon {
+    width: 18px;
+    height: 18px;
+  }
+}
+
+.indicator {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  color: white;
+}
+
+.icon {
+  stroke-width: 3;
+}

src/lib/components/ui/switch/Switch.svelte

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+<!-- Switch Component -->
+<script lang="ts">
+	import { Switch as SwitchPrimitive } from 'bits-ui';
+	import { cn } from '$lib/utils.js';
+	import styles from './switch.module.scss';
+	import type { HTMLButtonAttributes } from 'svelte/elements';
+
+	interface Props extends Omit<HTMLButtonAttributes, 'value'> {
+		checked?: boolean;
+		disabled?: boolean;
+		required?: boolean;
+		name?: string;
+		value?: string;
+		onCheckedChange?: (checked: boolean) => void;
+		class?: string;
+		thumbClass?: string;
+	}
+
+	let {
+		checked = $bindable(false),
+		disabled = false,
+		required = false,
+		name,
+		value,
+		onCheckedChange,
+		class: className,
+		thumbClass,
+		...restProps
+	}: Props = $props();
+
+	$: if (onCheckedChange && checked !== undefined) {
+		onCheckedChange(checked);
+	}
+</script>
+
+<SwitchPrimitive.Root
+	bind:checked
+	{disabled}
+	{required}
+	{name}
+	{value}
+	class={cn(styles.switch, className)}
+	{...restProps}
+>
+	<SwitchPrimitive.Thumb class={cn(styles.thumb, thumbClass)} />
+</SwitchPrimitive.Root>

src/lib/components/ui/switch/switch.module.scss

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+@use 'themes/spacing';
+@use 'themes/colors';
+@use 'themes/layout';
+
+.switch {
+  $height: 34px;
+  background: colors.$grey-70;
+  border-radius: calc($height / 2);
+  border: none;
+  padding-left: spacing.$unit-half;
+  padding-right: spacing.$unit-half;
+  position: relative;
+  width: 58px;
+  height: $height;
+  cursor: pointer;
+  transition: background-color 100ms ease-out;
+
+  &:focus,
+  &:focus-visible {
+    box-shadow: 0 0 0 2px var(--accent-blue-focus);
+    outline: none;
+  }
+
+  &[data-state='checked'] {
+    background: var(--accent-blue);
+  }
+
+  &:disabled {
+    box-shadow: none;
+    cursor: not-allowed;
+    opacity: 0.5;
+
+    .thumb {
+      background: colors.$grey-80;
+      cursor: not-allowed;
+    }
+  }
+}
+
+.thumb {
+  background: colors.$grey-100;
+  border-radius: 13px;
+  display: block;
+  height: 26px;
+  width: 26px;
+  transition: transform 100ms;
+  transform: translateX(0px);
+  cursor: pointer;
+
+  &[data-state='checked'] {
+    background: colors.$grey-100;
+    transform: translateX(24px);
+  }
+}