Move frontmatter processing from core Quartz into a standalone plugin.
Parse YAML/TOML frontmatter, extract links from property values,
and render an Obsidian-like properties panel in the page.
Supports: includeAll/includedProperties/excludedProperties filtering,
hidePropertiesView mode, wikilink/markdown link resolution in values,
collapsible panel with client-side state persistence, i18n.
