Table of contents, single-window focus, and Sequoia support

New

• Table of Contents menu in the note header lets you jump between headings in both source and preview mode, with indentation that mirrors your document structure.
• Scrollable tab strip — when tabs overflow the visible area, the strip scrolls horizontally with edge fading. New tabs and tab switches auto-scroll into view.
• macOS Sequoia support — Cogito now runs on macOS Sequoia 15 and later, with Liquid Glass preserved on Tahoe.

Improved

• Single document window — Quick Open, Finder, and deep links all open notes as tabs in your existing window instead of spawning new ones. Shift+Enter in Quick Open opens a new tab.
• Breadcrumbs use the full available width, and sort options have moved into the location menu for a cleaner toolbar.
• Frontmatter arrays render as inline pills in preview for easier scanning.
• Polished the Customize Location sheet layout and spacing.

Fixed

• Context menus in the sidebar no longer flicker or close unexpectedly when background file changes trigger a refresh.