chore: Make Text Input and Text Area uncontrolled in stories

[alimpens]

Describe the pull request

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What

It changes Text Input and Text Area to uncontrolled components in Storybook.

Why

Controlled components do not change automatically when interacting with them, you have to set an onChange handler for that. We didn't for Text Input and Text Area, which means you can't change the text. This PR fixes that.

How

By using defaultValue instead of value.

Checklist

Before submitting your pull request, please ensure you have done the following. Check each checkmark if you have done so or if it wasn't necessary:

• Add or update unit tests
• Add or update documentation
• Add or update stories
• Add or update exports in index.* files
• Start the PR title with a Conventional Commit prefix, as explained here.

Additional notes

• Provide links to any related issues or discussions.
• Add a link to the specific story in the feature branch deploy.
• Mention any areas where additional review or feedback is needed.