Add custom SVG cursors and update cursor handling

- Introduced new SVG cursor assets: cross, default, export, move, open, pen, and pointing.
- Implemented SCSS styles for cursor usage in the scene container, defining specific cursors for different modes (draw, pointer, pen, measure, hand).
- Enhanced cursor functionality by adding a utility function to handle canvas cursor changes based on user actions, mapping specific actions to corresponding cursor styles.

app/src/styles/main.scss

@@ -45,4 +45,5 @@
 
 //
 @use "./scene/scene";
-@use "./scene/comments";
+@use "./scene/comments";
+@use "./scene/cursors.scss";