Function isElectronContext

Checks if the current execution context is an Electron environment.

The check uses three heuristics:

1. Node integration: Detects if process.versions.electron exists.
2. Preload bridge: Detects if a custom window.electron object is present.
3. Fallback: Checks if navigator.userAgent contains "electron".

Returns

true if running in an Electron context, otherwise false.