v1.0.1

• Add drawing tools: Blur, Highlight, Circle, Rectangle, Arrow, Text
• Color picker, size slider, keyboard shortcuts (Ctrl+C/V/Z, Esc)
• Image upload, clipboard paste, copy to clipboard export
• Fit to screen, zoom controls, undo, right-click context menu
• Modern dark theme with emoji buttons and tool highlighting
• Help dialog with shortcuts and quick start guide