feat(input-textarea): add preview functionality

[brc-dd]

https://deploy-preview-471--sefirot-story.netlify.app/story/stories-components-sinputtextarea-01-playground-story-vue?variantId=_default

We can probably leave .prose ... styles to be implemented at consumer-side because they largely will be common with the actual post rendering.

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[kiaking]

Did deign on Figma. Thinking to go with this. In the future, we may add action bar too if we want (like GitHub has 👀

[kiaking]

@brc-dd Updated the style!

• Refactored css (put base stuff on top, custom at bottom)
• Adjusted fill option handling.

We can probably leave .prose ... styles to be implemented at consumer-side because they largely will be common with the actual post rendering.

And I agree on this 👍

[kiaking]

Feel free to merge when you're ready. Nothing from my side anymore 🙌

[kiaking]

Oops wait, forgot about error state. Gonna fix it.

[kiaking]

OK, done.

[brc-dd]

LGTM