feat: refactor all dashboard routes

app/routes/acls/components/cm.client.tsx

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+import React, { useEffect } from 'react'
+import Merge from 'react-codemirror-merge'
+import CodeMirror from '@uiw/react-codemirror'
+import * as shopify from '@shopify/lang-jsonc'
+import { ClientOnly } from 'remix-utils/client-only'
+import { ErrorBoundary } from 'react-error-boundary'
+import { githubDark, githubLight } from '@uiw/codemirror-theme-github'
+import { useState } from 'react'
+import { cn } from '~/utils/cn'
+
+import Fallback from './fallback'
+
+interface EditorProps {
+	isDisabled?: boolean
+	value: string
+	onChange: (value: string) => void
+}
+
+export function Editor(props: EditorProps) {
+	const [light, setLight] = useState(false)
+	useEffect(() => {
+		const theme = window.matchMedia('(prefers-color-scheme: light)')
+		setLight(theme.matches)
+		theme.addEventListener('change', (theme) => {
+			setLight(theme.matches)
+		})
+	})
+
+	return (
+		<div className={cn(
+			'border border-gray-200 dark:border-gray-700',
+			'rounded-b-lg rounded-tr-lg mb-2 z-10 overflow-x-hidden',
+		)}>
+			<div className="overflow-y-scroll h-editor text-sm">
+				<ErrorBoundary fallback={
+					<p className={cn(
+						'w-full h-full flex items-center justify-center',
+						'text-gray-400 dark:text-gray-500 text-xl',
+					)}>
+						Failed to load the editor.
+					</p>
+				}>
+					<ClientOnly fallback={<Fallback acl={props.value} />}>
+					{() => (
+						<CodeMirror
+							value={props.value}
+							height="100%"
+							extensions={[shopify.jsonc()]}
+							style={{ height: "100%" }}
+							theme={light ? githubLight : githubDark}
+							onChange={(value) => props.onChange(value)}
+						/>
+					)}
+					</ClientOnly>
+				</ErrorBoundary>
+			</div>
+		</div>
+	)
+}
+
+interface DifferProps {
+	left: string
+	right: string
+}
+
+export function Differ(props: DifferProps) {
+	const [light, setLight] = useState(false)
+	useEffect(() => {
+		const theme = window.matchMedia('(prefers-color-scheme: light)')
+		setLight(theme.matches)
+		theme.addEventListener('change', (theme) => {
+			setLight(theme.matches)
+		})
+	})
+
+	return (
+		<div className={cn(
+			'border border-gray-200 dark:border-gray-700',
+			'rounded-b-lg rounded-tr-lg mb-2 z-10 overflow-x-hidden',
+		)}>
+			<div className="overflow-y-scroll h-editor text-sm">
+				{props.left === props.right ? (
+					<p className={cn(
+						'w-full h-full flex items-center justify-center',
+						'text-gray-400 dark:text-gray-500 text-xl',
+					)}>
+						No changes
+					</p>
+				) : (
+					<ErrorBoundary fallback={
+						<p className={cn(
+							'w-full h-full flex items-center justify-center',
+							'text-gray-400 dark:text-gray-500 text-xl',
+						)}>
+							Failed to load the editor.
+						</p>
+					}>
+						<ClientOnly fallback={<Fallback acl={props.right} />}>
+						{() => (
+							<Merge
+								orientation="a-b"
+								theme={light ? githubLight : githubDark}
+							>
+								<Merge.Original
+									readOnly
+									value={props.left}
+									extensions={[shopify.jsonc()]}
+								/>
+								<Merge.Modified
+									readOnly
+									value={props.right}
+									extensions={[shopify.jsonc()]}
+								/>
+							</Merge>
+						)}
+						</ClientOnly>
+					</ErrorBoundary>
+				)}
+			</div>
+		</div>
+	)
+}

app/routes/acls/components/error.tsx

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+import { cn } from '~/utils/cn'
+import { AlertIcon } from '@primer/octicons-react'
+
+import Card from '~/components/Card'
+import Code from '~/components/Code'
+
+interface Props {
+	message: string
+}
+
+export function ErrorView({ message }: Props) {
+	return (
+		<Card variant="flat" className="max-w-full mb-4">
+			<div className="flex items-center justify-between">
+				<Card.Title className="text-xl mb-0">
+					Error
+				</Card.Title>
+				<AlertIcon className="w-8 h-8 text-red-500"/>
+			</div>
+			<Card.Text className="mt-4">
+				Could not apply changes to your ACL policy
+				due to the following error:
+				<br />
+				<Code>
+					{message}
+				</Code>
+			</Card.Text>
+		</Card>
+	)
+}

app/routes/acls/components/fallback.tsx

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+import Spinner from '~/components/Spinner'
+import { cn } from '~/utils/cn'
+
+interface Props {
+	readonly acl: string
+}
+
+export default function Fallback({ acl }: Props) {
+	return (
+		<div className="inline-block relative w-full h-editor">
+			<Spinner className="w-4 h-4 absolute p-2" />
+			<textarea
+				readOnly
+				className={cn(
+					'w-full h-editor font-mono resize-none',
+					'text-sm text-gray-600 dark:text-gray-300',
+					'bg-ui-100 dark:bg-ui-800',
+					'pl-10 pt-1 leading-snug',
+				)}
+				value={acl}
+			/>
+		</div>
+	)
+}

app/routes/acls/components/unavailable.tsx

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+import { cn } from '~/utils/cn'
+import { AlertIcon } from '@primer/octicons-react'
+
+import Code from '~/components/Code'
+import Card from '~/components/Card'
+
+interface Props {
+	mode: 'file' | 'database'
+}
+
+export function Unavailable({ mode }: Props) {
+	return (
+		<Card variant="flat" className="max-w-prose mt-12">
+			<div className="flex items-center justify-between">
+				<Card.Title className="text-xl mb-0">
+					ACL Policy Unavailable
+				</Card.Title>
+				<AlertIcon className="w-8 h-8 text-red-500"/>
+			</div>
+			<Card.Text className="mt-4">
+				Unable to load a valid ACL policy configuration.
+				This is most likely due to a misconfiguration in your
+				Headscale configuration file.
+			</Card.Text>
+
+			{mode !== 'file' ? (
+				<p className="mt-4 text-sm">
+					According to your configuration, the ACL policy mode
+					is set to <Code>file</Code> but the ACL file is not
+					available. Ensure that the <Code>policy.path</Code> is
+					set to a valid path in your Headscale configuration.
+				</p>
+			) : (
+				<p className="mt-4 text-sm">
+					In order to fully utilize the ACL management features of
+					Headplane, please set <Code>policy.mode</Code> to either
+					{' '}<Code>file</Code> or <Code>database</Code> in your
+					Headscale configuration.
+				</p>
+			)}
+		</Card>
+	)
+}