perf: optimize Lighthouse performance score#147
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Coordinated by Lighthouse Performance optimization Task Force. Changes: 1. Font Display: Overrode @font-face definition for bootstrap-icons in styles.css with 'font-display: block'. 2. Reflow & Thrashing Minimization: - Cached contentContainer dimensions during resizer drags, eliminating getBoundingClientRect() calls in handleResize/handleResizeTouch. - Cached editor and preview pane scroll/client dimensions on geometry events, and read them inside scroll sync handlers, eliminating layout calls during scrolling. 3. On-Demand Lazy Loading: - Removed js-yaml.min.js and FileSaver.min.js from index.html head to reduce initial bundle by 53KB. - Configured parseFrontmatter() to fetch js-yaml asynchronously on-demand and re-render once loaded. - Wrapped exports in triggerSaveAs() to lazy-load FileSaver with spinner dropdown feedback. 4. Render Blocking & LCP: - Inlined critical UI variables, layouts, and skeleton CSS styles inside head. - Preloaded core JS scripts (marked, purify, highlight). - Loaded external styles (bootstrap, github-markdown, styles) asynchronously using non-blocking preload style loaders. 5. Deferral: Deferred non-critical format toolbar, find-and-replace, and modals initialization using 50ms setTimeout.
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Coordinated by Lighthouse Performance optimization Task Force.
Changes: