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Add line-number gutter to the Markdown editor - #9
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Wrap the editor textarea in a CodeArea component that renders a scroll-synced line-number gutter. A hidden mirror measures how many visual rows each logical line wraps to, so numbers stay aligned even when prose soft-wraps.
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What
Adds a line-number gutter down the left edge of the Markdown editor.
How
A new
CodeAreacomponent wraps the editor<textarea>and renders a gutter beside it. Because a plain textarea can't draw a gutter, a hidden mirror node replicates the textarea's exact text rendering to measure how many visual rows each logical line wraps to. The gutter reserves matching height per number and is translated in lock-step with the textarea's scroll, so:The gutter is
aria-hiddenand non-selectable, so it stays out of the accessibility tree and copy/paste.Verify
tsc --noEmitandeslintclean.