Race condition when stories and their components are updated out of order

[fwouts]

Due to how components are cached across detection refreshes (https://github.com/fwouts/previewjs/blob/main/core/src/detect-components.ts), there is a particular edge case where stories will never be detected:

• src/Component.stories.js is created with stories referencing component A from src/Component.tsx
• src/Component.tsx doesn't exist yet (or it does, but A isn't exported yet)
• Preview.js loads and detects components, but stories aren't detected because the associated component cannot be found
• src/Component.tsx is updated and A is now exported
• Preview.js correctly refreshes and detects A but since src/Component.stories.js hasn't been touched, its stories aren't re-detected (even though they would now be)