fix(Input): minor styling fixes and storybook refactoring

[nicmell]

fix(Input)

Minor fixes to the inputs components, better storybook stories.

BaseInput

- changed icons' color if the field is empty
- horizontal vertical padding
- padding in readonly and hidden icons

InputNumber

- fixed theming

Search

- changed default icon
- fixed icon color

Select

- fix on padding in multiselect
- move clear button and made it visible even when not hovering

[IMPORTANT] PR Checklist

• [x] I am aware of standards and conventions adopted in this repository, defined in the CONTRIBUTING.md file

PR conventions

Please make sure your PR complies with the following rules before submitting it.

• [x] PR title follows the <type>(<scope>): <subject> structure
• [x] The PR has been labeled according to the type of changes (e.g., enhancement, bug).

Additional code checks

Based on your changes, some of these checks may not apply. Please make sure to check the relevant items in the list.

• [x] Changes are covered by tests
• [x] Changes to components are accessible and documented in the Storybook
• [x] Typings have been updated
• [x] New components are exported from the index file
• [x] New files include the Apache 2.0 License disclaimer
• [x] The browser console does not contain errors