fix(editor): should record edgeless connector mode (#12426)

Close [BS-3355](https://linear.app/affine-design/issue/BS-3355/白板快捷键c没有记住上次用的connector形状)

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

- **New Features**
  - Added the ability to cycle through connector modes (Curve, Orthogonal, Straight) using the 'c' keyboard shortcut when the connector tool is active.
- **Bug Fixes**
  - Improved the logic for remembering and restoring the last used connector mode when switching between tools.
- **Tests**
  - Introduced a new end-to-end test to verify correct cycling and restoration of connector modes.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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

@@ -3,12 +3,10 @@ import {
   DefaultTool,
   OverlayIdentifier,
 } from '@blocksuite/affine-block-surface';
-import type {
-  Connection,
-  ConnectorElementModel,
-  ConnectorMode,
-} from '@blocksuite/affine-model';
 import {
+  type Connection,
+  type ConnectorElementModel,
+  ConnectorMode,
   GroupElementModel,
   ShapeElementModel,
   ShapeType,
@@ -223,4 +221,15 @@ export class ConnectorTool extends BaseTool<ConnectorToolOptions> {
 
     this.findTargetByPoint(point);
   }
+
+  getNextMode() {
+    switch (this.activatedOption.mode) {
+      case ConnectorMode.Curve:
+        return ConnectorMode.Orthogonal;
+      case ConnectorMode.Orthogonal:
+        return ConnectorMode.Straight;
+      case ConnectorMode.Straight:
+        return ConnectorMode.Curve;
+    }
+  }
 }