fix: update canvas toolbar and canvas settings for improved usability

- Updated the CanvasToolbar to provide a clearer label for the scissors tool, enhancing user understanding of its functionality.
- Modified the CanvasInner component to disable grid snapping, allowing for more flexible positioning of elements on the canvas.

components/canvas/canvas-toolbar.tsx

@@ -138,7 +138,7 @@ export default function CanvasToolbar({
         <Hand className="size-4" />,
         "Hand (H) — schwenken: Leertaste gedrückt halten und ziehen oder linke Maustaste",
       )}
-      {toolBtn("scissor", <Scissors className="size-4" />, "Kanten schneiden")}
+      {toolBtn("scissor", <Scissors className="size-4" />, "Schere (K) — Verbindungen kappen")}
 
       <Button
         type="button"