v2.6.2 - Empty Hint Fix

🐛 Bug Fixes

• Empty canvas hint now hides immediately when starting to draw or adding shapes from shape library
  • Previously the hint would only disappear after completing the first drawing action
  • Now it hides as soon as you start drawing with pencil, shapes, bezier curves, smooth curves, or add shapes from the shape library

📦 Changes

• Added hideEmptyHint() method for immediate hint hiding
• Added updateEmptyHint() method that also checks for currentObject state
• Applied immediate hiding in:
  • Shape drawing tools (rectangle, circle, pencil, line, arrow, etc.)
  • Bezier curve tool
  • Smooth curve tool
  • Shape library panel