Add Infinite Canvas and Whiteboard Features

Please add a feature that allows users to expand the note canvas whenever they need more space.

Users should be able to add extra space to any side of the note, such as the top, bottom, left, or right. Ideally, the user could choose the direction and amount of space to add, allowing them to extend the note without having to create a new page or reorganize their existing content.

For example, if a user reaches the bottom of a note, they could simply add more space below it. If they need to add something next to existing content, they could expand the canvas to the left or right.

It would also be very useful to add an infinite whiteboard mode, where the canvas has no fixed boundaries and users can freely write, draw, and organize content in any direction without running out of space.

These features would make the app much more flexible for handwritten notes, diagrams, mind maps, and brainstorming.