The edit-docs tool would hang on startup when the Electron 'ready' event
fired before the event listener was registered. This race condition occurred
because:
1. startElectron() creates a deferred promise and registers a 'ready' listener
2. The 'ready' event fires asynchronously at some point during app initialization
3. If async work (like config loading) delays the listener registration,
Electron may already be ready when app.on('ready', ...) is called
4. Once fired, the 'ready' event doesn't fire again, leaving the listener
waiting forever
The fix checks electron.app.isReady() before registering the listener:
- If already ready: execute the handler immediately
- If not ready: register the listener as before
This ensures the initialization sequence completes regardless of timing.
The issue became apparent while working on making edit-docs reusable from
other projects (see #8343), where config loading added enough async delay
to consistently trigger the race condition.
Related: https://github.com/TriliumNext/Trilium/issues/8343
