Add missing TypeScript package and update readme

Unfortunately we have to keep a second copy for now. The lockfile
specifies the same version as used in the root package to avoid issues.
This may be replaced with Node.js type stripping in the future.

README.md is updated to include the correct command for testing the
Electron wrapper.

README.md

@@ -69,7 +69,7 @@ and does not intend to provide compatibility for older clients.
 -   Run `yarn` in the root folder and in `electron/`.
 -   Run `yarn gulp` in the root folder to build and serve files.
     Ignore the browser tab that opens.
--   Open a new terminal and run `yarn startDev` in `electron/` to open an Electron window.
+-   Open a new terminal and run `yarn start` in `electron/` to open an Electron window.
     -   Tip: If you open the Electron window too early, you can reload it when focused on DevTools.
 
 ### Release

electron/package.json

@@ -10,6 +10,7 @@
     },
     "dependencies": {},
     "devDependencies": {
-        "electron": "^31.3.0"
+        "electron": "^31.3.0",
+        "typescript": "^5.4.5"
     }
 }

electron/yarn.lock

@@ -495,6 +495,11 @@ type-fest@^0.13.1:
   resolved "https://registry.yarnpkg.com/type-fest/-/type-fest-0.13.1.tgz#0172cb5bce80b0bd542ea348db50c7e21834d934"
   integrity sha512-34R7HTnG0XIJcBSn5XhDd7nNFPRcXYRZrBB2O2jdKqYODldSzBAqzsWoZYYvduky73toYS/ESqxPvkDf/F0XMg==
 
+typescript@5.4.5:
+  version "5.4.5"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-5.4.5.tgz#42ccef2c571fdbd0f6718b1d1f5e6e5ef006f611"
+  integrity sha512-vcI4UpRgg81oIRUFwR0WSIHKt11nJ7SAVlYNIu+QpqeyXP+gpQJy/Z4+F0aGxSE4MqwjyXvW/TzgkLAx2AGHwQ==
+
 undici-types@~5.26.4:
   version "5.26.5"
   resolved "https://registry.yarnpkg.com/undici-types/-/undici-types-5.26.5.tgz#bcd539893d00b56e964fd2657a4866b221a65617"