Features
- app: add collapsible file list controls and dropped file tab option (#578, #588)
- app: add safe unused image cleanup (#567)
- app: unify default fonts across platforms (#586)
- desktop: add adaptive macOS app icon (#523)
- editor: replace Milkdown with CodeMirror and restore feature parity
- editor: add Typewriter and Vim modes (#557, #568)
- editor: improve frontmatter, reference, code paste, and slash-menu editing (#589)
- settings: add custom theme and Markdown marker controls (#577, #582)
- shortcuts: support Alt-only keybindings (#573)
- updater: add preview release channel
Bug Fixes
- app: isolate editor mode changes by tab (#585)
- editor: stabilize code blocks, headings, tables, links, images, and Mermaid editing
- editor: improve caret, selection, drag, spellcheck, and IME behavior
- settings: show active sidebar category (#592)
- release: improve prerelease, Homebrew, and Debian packaging