refactor(canvas): remove unused animation and optimize edge insertion timing

- Removed the unused CSS animation for edge insertion to streamline the codebase.
- Updated the edge insertion reflow duration from 1297ms to 997ms for improved performance.
- Refactored transition timing function for edge insertion to enhance animation smoothness.
- Cleaned up related test cases to reflect the changes in edge insertion logic.

components/canvas/canvas.tsx

@@ -82,7 +82,7 @@ interface CanvasInnerProps {
   canvasId: Id<"canvases">;
 }
 
-const EDGE_INSERT_REFLOW_SETTLE_MS = 1297;
+const EDGE_INSERT_REFLOW_SETTLE_MS = 997;
 
 function CanvasInner({ canvasId }: CanvasInnerProps) {
   const t = useTranslations('toasts');