docs(web-components-vite): document Stencil import injection for static builds

[harshit-d3v]

Summary

• document the Stencil configuration needed for static Storybook builds when using @storybook/web-components-vite
• explain that projects using defineCustomElements() from the generated loader need import injection enabled so Vite includes lazy-loaded component entry files
• add the Stencil 4.26+ config example using �xtras.enableImportInjection
• mention �xperimentalImportInjection for older Stencil versions

Relates to #25704.

Testing

• validated the updated documentation files in the editor
• docs-only change

[valentinpalkovic]

Hi @harshit-d3v,

Due to a recent high volume of unreviewed AI-generated PRs, we are requesting verification and proof that the implemented fix actually works. Please provide a simple GIF/Video or image of how the fix works, optimally with before-and-after comparisons.

Thank you for your understanding!

[harshit-d3v]

Hi @valentinpalkovic , thanks for flagging this. This is a docs-only PR, so I’ve attached a before/after screenshot of the added guidance.

I verified the guidance against the related issue (#25704) and also confirmed locally that @stencil/core supports both enableImportInjection and experimentalImportInjection.