This PR replaces the limited "States" dropdown in the Style Panel with a
flexible input field that supports any CSS selector, pseudo-class, or
pseudo-element. This allows for advanced styling capabilities such as
`:has()`, `:focus-visible`, and complex combinators.
## Key Changes
### Flexible Selector Input
- Replaced the fixed "States" category list with a free-form input
field.
- Supports **any** valid CSS selector (e.g., `:hover`, `::before`,
`:has(:checked)`).
- Validation logic ensures only valid selectors are accepted (triggered
on `Enter` key).
## How to Test
1. Select an element and open the Style Panel.
2. Click on the Local style source or a Token.
3. In the input field (bottom of menu), type a selector like `:hover` or
`:first-child` and press Enter.
4. Verify the selector is added and selected.
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Co-authored-by: zehjotkah <111518041+zehjotkah@users.noreply.github.com>
## Description
1. What is this PR about (link the issue and add a short description)
## Steps for reproduction
1. click button
2. expect xyz
## Code Review
- [ ] hi @kof, I need you to do
- conceptual review (architecture, feature-correctness)
- detailed review (read every line)
- test it on preview
## Before requesting a review
- [ ] made a self-review
- [ ] added inline comments where things may be not obvious (the "why",
not "what")
## Before merging
- [ ] tested locally and on preview environment (preview dev login:
0000)
- [ ] updated [test
cases](https://github.com/webstudio-is/webstudio/blob/main/apps/builder/docs/test-cases.md)
document
- [ ] added tests
- [ ] if any new env variables are added, added them to `.env` file
