Convert web app to Electron desktop application

[yannicka]

Description

This PR converts the Bobby web application into an Electron desktop application while maintaining all existing functionality.

Changes

• Added Electron as a dependency
• Created main process file (electron/main.js) to handle application lifecycle
• Created preload script (electron/preload.js) for secure context bridging
• Updated package.json with Electron configuration and build settings
• Added electron-builder configuration for packaging the app
• Updated .gitignore to exclude dist directory

Testing

The application has been successfully packaged as an AppImage for Linux. Additional testing on different platforms (Windows, macOS) is recommended before release.

Screenshots

N/A - UI remains unchanged, but now runs as a desktop application

Notes

• The application can be packaged for Windows and macOS with additional configuration
• The packaged application is available in the dist/ directory (not committed to the repository)