Quick / basic handwriting support (Excalidraw integration)

Since some of us love visual note taking, it would be awesome to have a quick way to scribble. Sometimes a diagram or a handwritten thought is just faster than typing.

Adding a lightweight Excalidraw canvas would be the perfect solution. It would allow us to make quick sketches that save directly into our Obsidian vault, keeping everything compatible with the Excalidraw plugin. This would make the app a lot more versatile for visual thinkers!