• Open note in new window (right-click → "Open in New Window")
• Single-instance file handling: opening .md from OS file manager opens in running instance
• First-launch file argument support (helixnotes /path/to/note.md)
• H1 title in markdown body for external editor compatibility (Markor, etc.)
• Auto-rename file on disk when changing note title in editor
• Line height setting in Settings > Styling (Tight/Default/Relaxed/Loose)
• Close-to-tray scoped to main window only, note windows close normally