Feat/select specific fields

[MarleenEliza]

• Per-Field Configuration: Introduced a new Field Add-on that allows administrators to explicitly select which Custom Styles and Custom Marks are provided to editors on a per-block basis.

solves #10

[Copilot]

Pull request overview

This PR adds a Structured Text field add-on to let admins enable/disable which custom block styles and inline marks are available per field/block, extending the existing plugin-wide custom styles/marks configuration.

Changes:

• Added a manual field extension (add-on) with a configuration UI to select allowed style/mark slugs per Structured Text field.
• Updated Structured Text hooks to filter custom styles/marks based on the configured field add-on parameters (with a fallback when the add-on isn’t present).
• Updated docs/changelog and bumped package version to 2.0.0.

Reviewed changes

Copilot reviewed 12 out of 16 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
src/utils/fieldParameters.ts	Adds parsing for per-field add-on parameters (allowedStyles/allowedMarks).
src/main.tsx	Registers the manual field extension and filters provided styles/marks per field.
src/global.d.ts	Updates global type definitions for CustomStyle/CustomStyleNode.
src/entrypoints/variables.ts	Updates node option typing and expands dummy styles/marks fixtures.
src/entrypoints/ManualFieldExtensionConfigScreen.tsx	New UI screen to configure allowed styles/marks per field add-on.
src/entrypoints/ManualFieldExtensionConfigScreen.module.css	Styles for the new field add-on configuration UI.
src/entrypoints/ConfigScreen.tsx	Adds a “Please Note” section and updates dummy style/mark creation.
src/entrypoints/ConfigScreen.module.css	Minor spacing change for the config form.
src/components/StyleCard/StyleCard.tsx	Removes unused imports.
src/components/MarkCard/MarkCard.module.css	Removes now-unused CSS module file content.
README.md	Fixes marks screenshot path and documents the new field add-on settings.
package.json	Bumps package version to 2.0.0.
package-lock.json	Updates lockfile metadata and dependency sections for the new release.
changelog.md	Adds 2.0.0 entry describing the per-field configuration feature.

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