Enables sandbox on about window

ts/context/activeWindowService.ts

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+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { ipcRenderer } from 'electron';
+import { getActiveWindowService } from '../services/ActiveWindowService';
+
+const activeWindowService = getActiveWindowService(
+  window.document,
+  ipcRenderer
+);
+
+export { activeWindowService };

ts/context/config.ts

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+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { RendererConfigType } from '../types/RendererConfig';
+import { strictAssert } from '../util/assert';
+
+const params = new URLSearchParams(document.location.search);
+const configParam = params.get('config');
+strictAssert(typeof configParam === 'string', 'config is not a string');
+const config: RendererConfigType = JSON.parse(configParam);
+
+export { config };

ts/context/environment.ts

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+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { config } from './config';
+import {
+  getEnvironment,
+  parseEnvironment,
+  setEnvironment,
+} from '../environment';
+
+setEnvironment(parseEnvironment(config.environment));
+
+const environment = getEnvironment();
+
+export { environment };

ts/context/i18n.ts

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+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { ipcRenderer } from 'electron';
+import { config } from './config';
+import { setupI18n } from '../util/setupI18n';
+import { strictAssert } from '../util/assert';
+
+const { resolvedTranslationsLocale } = config;
+strictAssert(
+  resolvedTranslationsLocale,
+  'locale could not be parsed from config'
+);
+strictAssert(
+  typeof resolvedTranslationsLocale === 'string',
+  'locale is not a string'
+);
+
+const localeMessages = ipcRenderer.sendSync('locale-data');
+const i18n = setupI18n(resolvedTranslationsLocale, localeMessages);
+
+export { i18n };

ts/context/waitForSettingsChange.ts

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+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { ipcRenderer as ipc } from 'electron';
+
+import { explodePromise } from '../util/explodePromise';
+
+let preferencesChangeResolvers = new Array<() => void>();
+
+ipc.on('preferences-changed', _event => {
+  const resolvers = preferencesChangeResolvers;
+  preferencesChangeResolvers = [];
+
+  for (const resolve of resolvers) {
+    resolve();
+  }
+});
+
+export function waitForSettingsChange(): Promise<void> {
+  const { promise, resolve } = explodePromise<void>();
+
+  preferencesChangeResolvers.push(resolve);
+
+  return promise;
+}