fix(frontend): keep node-reported text out of i18next's nesting parser

The SPA initialised i18next with nesting on, though no locale uses
$t(...), so its nesting regex, exponential on an unclosed "$t(", ran
over every missing key and interpolated value, including the status and
name a node reports for its sub-nodes. One crafted status froze the
Nodes page.

Nesting is switched off for every i18next instance the project creates,
an unknown status renders as Unknown instead of being used as a key,
and a sub-node is never named as the parent it is reached through.

frontend/src/i18n/react.ts

@@ -1,4 +1,5 @@
 import i18next from 'i18next';
+import type { InterpolationOptions } from 'i18next';
 import { initReactI18next } from 'react-i18next';
 
 import { LanguageManager } from '@/utils';
@@ -8,6 +9,16 @@ import enUS from '../../../internal/web/translation/en-US.json';
 
 const FALLBACK = 'en-US';
 
+// No locale uses $t(...) nesting, and its regex backtracks exponentially on an unclosed
+// "$t(" in untrusted text (node-reported names, remarks); no off switch, so never match.
+export const INTERPOLATION: InterpolationOptions = {
+  escapeValue: false,
+  prefix: '{',
+  suffix: '}',
+  nestingPrefix: '',
+  nestingPrefixEscaped: '(?!)',
+};
+
 const lazyModules = import.meta.glob([
   '../../../internal/web/translation/*.json',
   '!../../../internal/web/translation/en-US.json',
@@ -30,7 +41,7 @@ export async function readyI18n(scope: LanguageScope = 'panel') {
     lng: active,
     fallbackLng: FALLBACK,
     resources: { [FALLBACK]: { translation: enUS } },
-    interpolation: { escapeValue: false, prefix: '{', suffix: '}' },
+    interpolation: INTERPOLATION,
     returnNull: false,
   });
   if (active !== FALLBACK) {