v0.0.3

• Add six highlight colors: a color emoji right after the opening == (e.g. ==🔴Important==) renders as <mark data-highlight="red">Important</mark>. The emoji is treated as a color marker only and is not rendered; anywhere else it stays normal text.
• Show colored highlights in the editor as well, using the same palette as the preview.
• Add an editor context menu submenu "Highlight Selected Text" with the default color, the six colors, and "Remove Highlight" (this replaces the previous "Wrap Selection with Highlight" item).
• Add quick fixes (lightbulb) inside a highlight: change its color, switch back to the default color, or remove the highlight.
• Add autocomplete: type == to pick a color, which inserts the marker and places the cursor inside the highlight. Nothing is suggested inside code blocks or inline code.
• Rebind Ctrl + Shift + = to highlighting with the default color; applying it to text inside an existing highlight changes that highlight instead of nesting a new one.
• Remove the highlight snippet, now superseded by the color autocomplete.
• Style hand-written <mark data-highlight="..."> markup via CSS as a fallback.
• Fix wrong highlight positions in the editor when an earlier part of the file contains an unmatched backtick (for example a lone backtick in a table cell): inline code is now paired per line by backtick runs of equal length, so ==...== inside inline code is no longer highlighted and the real highlight next to it is no longer skipped.
• Recognize fenced code blocks nested in callouts/quotes and fences of four or more backticks, so ==...== inside them is no longer highlighted; an unclosed fence now extends to the end of the file.