Add Image Import Feature (Upload Image to Canvas)

[sanjana-ngl]

Description:
Allow users to upload an image (PNG/JPG) and place it onto the canvas.
This is useful for annotating diagrams, making notes on screenshots, or collaborative brainstorming.

Tasks:

Add an “Import Image” button in the toolbar

Implement file input ()

Load the selected image using FileReader

Draw the uploaded image onto the canvas

Allow users to drag/move/resize the imported image (optional enhancement)

Difficulty: Hard