v0.5.1 - Blockquotes, Horizontal Rules & Explorer

What's New

• Blockquotes: > quote syntax with multi-line support and themed rendering (Standard + Obsidianite)
• Horizontal rules: ---, ***, ___ (Markdown) and ----- (Org mode)
• Explorer panel: File navigation UI component
• Tests: 11 new unit tests for parser coverage (blockquotes, rules, headings, mixed content)

Notes

• Debug APK (release signing not available in this build)