Remove use of __dirname from main process

ts/types/packageJson.d.ts

@@ -0,0 +1,24 @@
+// Copyright 2026 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { ReadonlyDeep } from 'type-fest';
+
+export type PackageJsonType = ReadonlyDeep<{
+  name: string;
+  version: string;
+  productName: string;
+  build: {
+    appId: string;
+    mac: {
+      releaseInfo: {
+        vendor: {
+          minOSVersion: string;
+        };
+      };
+    };
+    deb: {
+      depends: Array<string>;
+    };
+    files: Array<string | Record<string, unknown>>;
+  };
+}>;