Print/PDF related fix - Fixed Print (⌘P) not working — added missing sandbox print entitlement - Fixed Export as PDF (⌘⇧E) save dialog not appearing — corrected file access permission - Print now uses native WKWebView print for proper page layout and light-mode output

- Added a FILES panel in the left sidebar that lists markdown files in the same folder - Click a file to open it in a new tab, or switch to it if already open - FILES and OUTLINE sections are independently collapsible with disclosure triangles - Resizable divider between FILES and OUTLINE sections - Folder path displayed above the file list - Added trackpad pinch-to-zoom gesture for content zoom - Drag-and-drop now works on the entire window, not just the content area - Sidebar toggle button replaces the old Table of Contents button (⌘⇧T)

- Large file performance: 30x faster rendering for big markdown files - Pagination for large documents with page navigation in the status bar - Table of Contents now scrolls smoothly even with hundreds of headings - Search pills respond on first click; keyword highlights clear properly when removed - Trusted image domains shared with QuickLook for automatic loading - Welcome screen shows saved highlight keywords and trusted domains on relaunch - Dark mode: improved color contrast for all alert types (Note, Tip, Warning, etc.) - External images now retry up to 3 times with a 30-second timeout - Files renamed in Finder are tracked automatically without losing the view - Updated KaTeX math rendering engine to latest version (0.16.44)

Enhanced Search - Multi-term highlight search — Add multiple search terms with distinct colors. Press Enter to add each term as a colored highlight pill. - N/M position indicator — Navigate matches with click or Cmd+G/Cmd+Shift+G. Pills show your current position (e.g. "3 of 12"). - Live preview — See matches highlighted in gray as you type, before committing with Enter. - Search suggestions — Autocomplete from words found in your document. - Push/Pop stack — Save your current search terms to a stack and restore them later. Per-file, up to 10 sets. - Case sensitivity & whole word toggles — Fine-tune your search with Aa and W buttons. - Scrollbar margin marks — Colored ticks on the right edge show where matches are in the document. Zoom & Layout - Font-size based zoom — Text scales without changing content layout width. Tables and wide content stay full width. - Zoom slider in the status bar with Cmd+/Cmd- keyboard shortcuts and Cmd+0 to reset. - Wider content area — Max content width increased from 900px to 1530px. External Images - Confirmation dialog before loading external images, showing the full URL. - "Always trust this domain" checkbox — Trusted domains auto-load without prompting. - Loading indicator with spinner while downloading and error state with retry. UI Improvements - Outline sidebar — Colored dots per heading level for clear document hierarchy. - Link URL tooltip — Hover any link to preview its destination URL. - Drag & drop — Drop markdown files anywhere in the window to open them. Security & Stability - Tightened Content Security Policy. - Privacy manifest (PrivacyInfo.xcprivacy) included. - File size check on auto-reload to prevent memory issues. - QuickLook extension threading safety fix.

- Table of Contents sidebar — VS Code-style outline sidebar for quick heading navigation (Cmd+Shift+T) - Multiple window support — Each file opens in its own window - Native toolbar search — Find text in documents with Cmd+F - Export as PDF — Save documents as PDF (Cmd+Shift+E) - Print support — Print documents with Cmd+P - Open Recent — Quickly reopen recently viewed files from File menu - Back-to-top button — Floating button for easy navigation in long documents - Copy button on code blocks — One-click code copying - Word count & reading time — Displayed in the status bar along with file path - Custom CSS support — Personalize rendering via ~/.config/mods/custom.css - Zoom level persistence — Zoom and TOC visibility remembered across sessions (Cmd+0 to reset) - mods:// URL scheme — Open files programmatically via URL - Scroll position preservation — Maintains position when files are reloaded - Finder double-click support — Open .md files directly from Finder - Non-UTF8 file support — Graceful handling of various text encodings - Security hardening — Content Security Policy, HTML sanitization, blocked external images, strict Mermaid rendering - Performance improvements — Lazy-loaded Mermaid/KaTeX, cached resources, optimized rendering pipeline