fix(plugin): resolve ESM import issues with preset and missing module

[timurzholudev]

Summary

This PR resolves two issues encountered when integrating @stencil/storybook-plugin:

• SB_CORE-SERVER_0002: Storybook failed to load the preset due to __dirname usage in an ES module context.
• ERR_MODULE_NOT_FOUND: Module resolution failed for component-to-jsx in render.js due to missing .js extension in import paths.

Changes Made

• Replaced __dirname with import.meta.url and fileURLToPath() in preset.js to ensure compatibility with ESM.
• Updated import statements to include .js extensions

Testing

• Verified that the Plugin builds without errors.
• Verified that Storybook starts without errors using npm run storybook.
• Confirmed that all components render successfully in the Storybook UI.
• Ensured no broken imports or runtime resolution issues occur.​
• Ensured tests are passing.

[christian-bromann]

Minor nit, otherwise LGTM 👍