Build a personal knowledge-base wiki as a static app in this directory: index.html, style.css, app.js, parser.js. Markdown editing with live preview using your own small parser (headings, bold, italic, links, inline code, code blocks, lists), multiple pages with [[wikilink]] syntax that creates/links pages, full-text search, localStorage persistence, JSON export/import, dark theme, keyboard shortcuts. Also create tests.html + tests.js exercising the parser and the wikilink graph. Run the tests headless with node and fix what fails.