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/use-canvas-edge-insertions.ts

@@ -27,7 +27,7 @@ export type EdgeInsertMenuState = {
 };
 
 const EDGE_INSERT_GAP_PX = 10;
-const DEFAULT_REFLOW_SETTLE_MS = 1297;
+const DEFAULT_REFLOW_SETTLE_MS = 997;
 
 function waitForReflowSettle(ms: number): Promise<void> {
   return new Promise((resolve) => {