v0.1.0 - Multi-Selection, Keyboard Shortcuts & Accessibility

MULTI-SELECTION:
• Ctrl+Click to toggle individual items
• Shift+Click for range selection
• Ctrl+A to select all visible items
• Bulk delete and download for multiple selections
• Visual checkbox indicators in multi-select mode

KEYBOARD SHORTCUTS:
• Ctrl+N / Cmd+N - New file
• Ctrl+Shift+N / Cmd+Shift+N - New folder
• F2 - Rename selected item
• Delete / Backspace - Delete selected items
• Arrow Up/Down - Navigate tree, Shift+Arrow to extend selection
• Home/End - Jump to first/last tree item
• Space - Toggle selection
• Context menus show platform-aware shortcut hints

ACCESSIBILITY (WCAG 2.1 AA):
• ARIA tree pattern with roving tabindex navigation
• Screen reader announcements via ARIA live regions
• Focus trap in modal dialogs with return-focus-to-trigger
• Skip navigation link for keyboard users
• prefers-reduced-motion support (disables animations)
• Windows High Contrast mode (forced-colors) support
• focus-visible styling on all interactive elements
• Descriptive aria-labels on all buttons and regions

UI ENHANCEMENTS:
• Context menus with icons, shortcut hints, and section separators
• Type-ahead character search in context menus
• Image preview keyboard shortcuts (+/- zoom, R rotate, 0 reset)
• Keyboard-accessible resize handle (Shift+Arrow for larger steps)
• Proper breadcrumb markup with aria-current
• Storage bar with progressbar role and ARIA values

This is a major UI/UX and accessibility update. The extension now meets WCAG 2.1 AA standards with comprehensive keyboard navigation and screen reader support.