build ok,

002_source/cms/src/app/errors/internal-server-error/page.tsx

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+import * as React from 'react';
+import type { Metadata } from 'next';
+import RouterLink from 'next/link';
+import Box from '@mui/material/Box';
+import Button from '@mui/material/Button';
+import Container from '@mui/material/Container';
+import Stack from '@mui/material/Stack';
+import Typography from '@mui/material/Typography';
+
+import { config } from '@/config';
+import { paths } from '@/paths';
+
+export const metadata = { title: `Internal server error | Errors | ${config.site.name}` } satisfies Metadata;
+
+export default function Page(): React.JSX.Element {
+  return (
+    <Box
+      component="main"
+      sx={{
+        alignItems: 'center',
+        display: 'flex',
+        flexDirection: 'column',
+        justifyContent: 'center',
+        minHeight: '100%',
+        py: '64px',
+      }}
+    >
+      <Container maxWidth="lg">
+        <Stack spacing={6}>
+          <Box sx={{ display: 'flex', justifyContent: 'center' }}>
+            <Box
+              alt="Internal server error"
+              component="img"
+              src="/assets/error.svg"
+              sx={{ height: 'auto', maxWidth: '100%', width: '200px' }}
+            />
+          </Box>
+          <Stack spacing={1} sx={{ textAlign: 'center' }}>
+            <Typography variant="h4">500: Internal server error</Typography>
+            <Typography color="text.secondary">
+              You either tried some shady route or you came here by mistake. Whichever it is, try using the navigation.
+            </Typography>
+          </Stack>
+          <Box sx={{ display: 'flex', justifyContent: 'center' }}>
+            <Button component={RouterLink} href={paths.home} variant="contained">
+              Back to home
+            </Button>
+          </Box>
+        </Stack>
+      </Container>
+    </Box>
+  );
+}

002_source/cms/src/app/errors/not-authorized/page.tsx

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+import * as React from 'react';
+import type { Metadata } from 'next';
+import RouterLink from 'next/link';
+import Box from '@mui/material/Box';
+import Button from '@mui/material/Button';
+import Container from '@mui/material/Container';
+import Stack from '@mui/material/Stack';
+import Typography from '@mui/material/Typography';
+
+import { config } from '@/config';
+import { paths } from '@/paths';
+
+export const metadata = { title: `Not authorized | Errors | ${config.site.name}` } satisfies Metadata;
+
+export default function Page(): React.JSX.Element {
+  return (
+    <Box
+      component="main"
+      sx={{
+        alignItems: 'center',
+        display: 'flex',
+        flexDirection: 'column',
+        justifyContent: 'center',
+        minHeight: '100%',
+        py: '64px',
+      }}
+    >
+      <Container maxWidth="lg">
+        <Stack spacing={6}>
+          <Box sx={{ display: 'flex', justifyContent: 'center' }}>
+            <Box
+              alt="Not authorized"
+              component="img"
+              src="/assets/error.svg"
+              sx={{ height: 'auto', maxWidth: '100%', width: '200px' }}
+            />
+          </Box>
+          <Stack spacing={1} sx={{ textAlign: 'center' }}>
+            <Typography variant="h4">401: Authorization required</Typography>
+            <Typography color="text.secondary">
+              You either tried some shady route or you came here by mistake. Whichever it is, try using the navigation.
+            </Typography>
+          </Stack>
+          <Box sx={{ display: 'flex', justifyContent: 'center' }}>
+            <Button component={RouterLink} href={paths.home} variant="contained">
+              Back to home
+            </Button>
+          </Box>
+        </Stack>
+      </Container>
+    </Box>
+  );
+}

002_source/cms/src/app/errors/not-found/page.tsx

@@ -0,0 +1,53 @@
+import * as React from 'react';
+import type { Metadata } from 'next';
+import RouterLink from 'next/link';
+import Box from '@mui/material/Box';
+import Button from '@mui/material/Button';
+import Container from '@mui/material/Container';
+import Stack from '@mui/material/Stack';
+import Typography from '@mui/material/Typography';
+
+import { config } from '@/config';
+import { paths } from '@/paths';
+
+export const metadata = { title: `Not found | Errors | ${config.site.name}` } satisfies Metadata;
+
+export default function Page(): React.JSX.Element {
+  return (
+    <Box
+      component="main"
+      sx={{
+        alignItems: 'center',
+        display: 'flex',
+        flexDirection: 'column',
+        justifyContent: 'center',
+        minHeight: '100%',
+        py: '64px',
+      }}
+    >
+      <Container maxWidth="lg">
+        <Stack spacing={6}>
+          <Box sx={{ display: 'flex', justifyContent: 'center' }}>
+            <Box
+              alt="Not found"
+              component="img"
+              src="/assets/not-found.svg"
+              sx={{ height: 'auto', maxWidth: '100%', width: '200px' }}
+            />
+          </Box>
+          <Stack spacing={1} sx={{ textAlign: 'center' }}>
+            <Typography variant="h4">404: The page you are looking for isn&apos;t here</Typography>
+            <Typography color="text.secondary">
+              You either tried some shady route or you came here by mistake. Whichever it is, try using the navigation.
+            </Typography>
+          </Stack>
+          <Box sx={{ display: 'flex', justifyContent: 'center' }}>
+            <Button component={RouterLink} href={paths.home} variant="contained">
+              Back to home
+            </Button>
+          </Box>
+        </Stack>
+      </Container>
+    </Box>
+  );
+}