Show HN: Glimpse, Markdown reader using Apple's on-device foundation model

Glimpse is a native macOS markdown viewer with on-device AI (Apple's FoundationModels) for summaries, key insights, and auto-glossary, requiring macOS 26. It features inline editing, file watching, presentation mode, offline KaTeX/Mermaid, and a QuickLook extension. Available on the Mac App Store with a 14-day free trial and subscription.