feat(markup): lineNumbers extension

[saxumcordis]

Preview

Summary by Sourcery

Add configurable line numbers and line highlighting support to the markup (CodeMirror) editor, and expose the related APIs and demos.

New Features:

• Introduce a MarkupLineNumbersConfig option on the markup editor to enable line numbers, optional line highlighting, and initial highlighted ranges.
• Add a scroll-to-line on mount capability for the markup editor via the line numbers configuration.
• Expose line highlighting utilities (lineHighlight extension, LineRange, LineHighlightOptions, setHighlightedLine) from the editor package API.
• Provide Storybook examples demonstrating markup line numbers, line highlighting, multi-line highlighting, and scroll-to-line behavior.

Enhancements:

• Extend the CodeMirror gravity theme to style the gutters and line numbers for better visual integration.

[sourcery-ai]

Reviewer's Guide

Implements a configurable CodeMirror-based line numbers and line-highlighting feature for the markup editor, wires it through the editor bundle API, styles it in the gravity theme, and adds demo Storybook examples plus public exports for consumers.

File-Level Changes

Change	Details	Files
Add configurable line numbers and line highlighting options to the markup editor configuration surface and plumb them through editor creation.	Introduce MarkupLineNumbersConfig with flags for enabling the gutter, line highlighting, initial selected range, click callback, and initial scroll line. Extend MarkdownEditorMarkupConfig and CreateCodemirrorParams to accept the new lineNumbers configuration. Expose markupConfig (and initialScrollToLine as a convenience getter) on the Editor implementation and pass lineNumbers through to createCodemirror.	packages/editor/src/bundle/types.ts packages/editor/src/markup/codemirror/create.ts packages/editor/src/bundle/Editor.ts
Implement CodeMirror line highlighting extension that integrates with line numbers and supports click-to-highlight plus programmatic control.	Create a lineHighlight extension that defines a highlighted line range StateField, a StateEffect (setHighlightedLine) to update it, and decorations for highlighted lines and gutter markers. Configure a clickable lineNumbers gutter that toggles selection on click and calls an optional onLineClick callback with the clicked 0-based line number. Export LineRange, LineHighlightOptions, lineHighlight, and setHighlightedLine from the markup codemirror module and the top-level editor index.	packages/editor/src/markup/codemirror/line-highlight/extension.ts packages/editor/src/markup/codemirror/line-highlight/index.ts packages/editor/src/markup/codemirror/index.ts packages/editor/src/index.ts
Style line numbers and highlighted lines to match the Gravity theme.	Update gravityTheme to style CodeMirror gutters and line numbers (background, border, text color, padding/min-width). Add theme rules in the lineHighlight extension for highlighted lines and gutter items, including pointer cursor on line numbers when clickable.	packages/editor/src/markup/codemirror/gravity.ts packages/editor/src/markup/codemirror/line-highlight/extension.ts
Add scroll-to-line-on-mount behavior in markup React component using the new lineNumbers configuration.	Read markupConfig.lineNumbers.scrollToLine on mount and, when line numbers are enabled and a target line is provided, move the cursor to that line in the markup editor.	packages/editor/src/bundle/MarkupEditorComponent.tsx
Provide Storybook demos showcasing markup line numbers, highlighting, and scroll-to-line features.	Create a MarkupLineNumbersEditor example that configures the editor in markup mode with lineNumbers and wires onLineClick to local state. Demonstrate programmatic highlighting via setHighlightedLine and clearing highlights using CM dispatch from the example UI. Add Storybook stories to showcase line-numbers-only, highlight single line, highlight multiple lines, scroll-to-line, and combined features variants.	demo/src/stories/examples/markup-line-numbers/Editor.tsx demo/src/stories/examples/markup-line-numbers/MarkupLineNumbers.stories.tsx

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[gravity-ui]

[gravity-ui]