feat(rich-text-field): add RichTextField component

[s3rgiosan]

Description of the Change

Adds a new RichTextField component: a drop-in wrapper around RichText for use outside a block's edit context (e.g. inside InspectorControls or a Modal).

RichText only works correctly inside a block's edit because the surrounding block-editor infrastructure provides a SlotFillProvider, a block-selection store, and a BlockControls slot for the format toolbar. When rendered outside that context, the format toolbar disappears, selection state is missing, and formatting fills get captured by the parent block's toolbar.

RichTextField solves this by providing:

1. A local SlotFillProvider so the format toolbar resolves inside the field instead of leaking into the surrounding block's toolbar.
2. inlineToolbar so the format toolbar renders as a popover near the caret.
3. Manual isSelected state with click-outside deselect that ignores the inline toolbar and any popovers it spawns (e.g. the link URL input).

The component accepts all RichText props except isSelected (managed internally) and forwards everything else through.

Files added/changed:

• components/rich-text-field/index.tsx — component implementation (TypeScript).
• components/rich-text-field/readme.md — usage, props, and modal z-index note.
• components/index.ts — export RichTextField.
• README.md — list the new component.

Closes #

How to test the Change

1. npm install && npm run build in this repo.
2. In a consumer plugin/theme, import the component:

   import { RichTextField } from '@10up/block-components';

3. Use inside a block's InspectorControls panel:

   <InspectorControls>
       <PanelBody title="Notes">
           <RichTextField
               value={attributes.note}
               onChange={(note) => setAttributes({ note })}
               placeholder="Type and select to see the toolbar…"
           />
       </PanelBody>
   </InspectorControls>

   • Type text, select it, confirm inline format toolbar appears near the caret.
   • Confirm formatting (bold, italic, link) applies inside the sidebar field, not on the parent block.
   • Click outside the field; confirm the toolbar dismisses.
   • Open the link format, type a URL in the popover; confirm clicking inside the popover does not deselect the field.
4. Repeat the same checks with RichTextField rendered inside a Modal. If the inline toolbar appears behind the modal, apply the CSS override documented in components/rich-text-field/readme.md.
5. Verify tagName, placeholder, allowedFormats, and className props all forward correctly.

Changelog Entry

Added - RichTextField component for using RichText outside a block's edit context (e.g. InspectorControls, Modal).

Credits

Props @s3rgiosan

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added Critical Flows, Test Cases, and/or End-to-End Tests to cover my change.
• All new and existing tests pass.

[fabiankaegy]

Can this get replaced by the useRefEffect hook?

[s3rgiosan]

Updated