In-editor widget development

[salmenf]

It would be nice to allow developers to use WebWriter directly as the development preview. This would also remove the need to set up a development environment for widget developers, so only WebWriter, npm and a text editor are needed to develop widgets.

Basic

• Use a file system watcher to automatically reimport the widget when code changes (Enable/disable in "Packages")
• Allow accessing folder of specific package
• Add package initialization ('npm init ...')
• Analyzing package.json to give feedback/error messages about the package structure
• Make it easier to publish development versions (hide versions with MAJOR < 1 by default? Add 'npm publish' interface to local packages)

Advanced

• Baseline Bundle Size: Sum of the size of all dependencies -> Just get the file size of the import test file
• Lighthouse Score: Loading performance of widget -> Get lighthouse score & report
• Accessibility: WCAG compliance -> Use axe-core

Problems:

• Tauri's file system scoping wouldn't allow for arbitrary package paths -> Developer version? Extra allowed path for packages? Just force development in data dir? --> Persisted Scope, remember every package path ever selected