feat: add error boundary

frontend/package.json

@@ -10,6 +10,7 @@
         "react": ">=19.2.0 <19.3.0",
         "react-chartjs-2": ">=5.3.0 <5.4.0",
         "react-dom": ">=19.2.0 <19.3.0",
+        "react-error-boundary": ">=6.1.0 <6.2.0",
         "react-syntax-highlighter": ">=16.1.0 <16.2.0"
     },
     "devDependencies": {

frontend/src/components/common/ErrorBoundary.tsx

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2021-2026 ahriman team.
+ *
+ * This file is part of ahriman
+ * (see https://github.com/arcan1s/ahriman).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+import { Box, Button, Typography } from "@mui/material";
+import type React from "react";
+import type { FallbackProps } from "react-error-boundary";
+
+interface ErrorDetails {
+    message: string;
+    stack: string | undefined;
+}
+
+export default function ErrorFallback({ error }: FallbackProps): React.JSX.Element {
+
+    const details: ErrorDetails = error instanceof Error
+        ? { message: error.message, stack: error.stack }
+        : { message: String(error), stack: undefined };
+
+    return <Box role="alert" sx={{ color: "text.primary", minHeight: "100vh", p: 6 }}>
+        <Typography sx={{ fontWeight: 700 }} variant="h4">
+            Something went wrong
+        </Typography>
+
+        <Typography color="error" sx={{ fontFamily: "monospace", mt: 2 }}>
+            {details.message}
+        </Typography>
+
+        {details.stack && <Typography
+            component="pre"
+            sx={{ color: "text.secondary", fontFamily: "monospace", fontSize: "0.75rem", mt: 3, whiteSpace: "pre-wrap", wordBreak: "break-word" }}
+        >
+            {details.stack}
+        </Typography>}
+
+        <Box sx={{ display: "flex", gap: 2, mt: 4 }}>
+            <Button onClick={() => window.location.reload()} variant="outlined">Reload page</Button>
+        </Box>
+    </Box>;
+}

frontend/src/main.tsx

@@ -21,11 +21,18 @@ import "chartSetup";
 import "utils";
 
 import App from "App";
+import ErrorFallback from "components/common/ErrorBoundary";
 import { StrictMode } from "react";
 import { createRoot } from "react-dom/client";
+import { ErrorBoundary } from "react-error-boundary";
 
 createRoot(document.getElementById("root")!).render(
     <StrictMode>
-        <App />
+        <ErrorBoundary
+            FallbackComponent={ErrorFallback}
+            onError={(error, info) => console.error("Uncaught error:", error, info.componentStack)}
+        >
+            <App />
+        </ErrorBoundary>
     </StrictMode>,
 );