fix(editor): shape tool should be the last used shape (#12425)

Close [BS-3305](https://linear.app/affine-design/issue/BS-3305/白板按s应该使用上次的shape形状)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
  - Added a method to cycle through shape types when using the shape tool.

- **Bug Fixes**
  - Improved shape tool behavior to ensure the selected shape type does not change unexpectedly after adding a new shape.

- **Tests**
  - Added an end-to-end test to verify that the shape tool retains the selected shape type after adding a new shape.
  - Enhanced shortcut tests to verify cycling shapes forward and backward using 's' and 'Shift+s' keys.

- **Refactor**
  - Streamlined the logic for cycling through shape types and connector modes for improved maintainability.
  - Removed external utility for cycling shapes, integrating the functionality directly into the shape tool.
  - Updated keyboard shortcut handling to use the new cycling method within the shape tool.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/gfx/connector/src/connector-tool.ts

@@ -223,13 +223,15 @@ export class ConnectorTool extends BaseTool<ConnectorToolOptions> {
   }
 
   getNextMode() {
-    switch (this.activatedOption.mode) {
-      case ConnectorMode.Curve:
-        return ConnectorMode.Orthogonal;
-      case ConnectorMode.Orthogonal:
-        return ConnectorMode.Straight;
-      case ConnectorMode.Straight:
-        return ConnectorMode.Curve;
-    }
+    // reorder the enum values
+    const modes = [
+      ConnectorMode.Curve,
+      ConnectorMode.Orthogonal,
+      ConnectorMode.Straight,
+    ];
+
+    const currentIndex = modes.indexOf(this.activatedOption.mode);
+    const nextIndex = (currentIndex + 1) % modes.length;
+    return modes[nextIndex];
   }
 }