Create RotateSeatingGroupTool.ts to implement rotation functionality

frontend/src/tools/drawing/RotateSeatingGroupTool.ts

@@ -0,0 +1,75 @@
+import { Tool } from '../Tool';
+import { YjsDocument } from '../../crdt/YjsDocument';
+
+class RotateSeatingGroupTool extends Tool {
+  private selectedElementIds: string[] = [];
+  private rotationAngle: number = 90; // Default rotation angle in degrees
+
+  constructor(yjsDoc: YjsDocument) {
+    super(yjsDoc);
+    this.name = 'RotateSeatingGroupTool';
+  }
+
+  onMouseDown(event: MouseEvent): void {
+    // This tool works on selected elements, not on mouse clicks
+    // The actual rotation logic would be triggered through a UI action
+  }
+
+  onMouseMove(event: MouseEvent): void {
+    // No preview needed for this tool
+  }
+
+  onMouseUp(event: MouseEvent): void {
+    // No action needed on mouse up
+  }
+
+  onKeyUp(event: KeyboardEvent): void {
+    // Handle key up events
+    if (event.key === 'Escape') {
+      this.reset();
+    }
+  }
+
+  reset(): void {
+    // Reset any state if needed
+    this.selectedElementIds = [];
+  }
+
+  // Rotate selected elements
+  rotateSelectedElements(): void {
+    // Get all elements from the document
+    const elements = this.yjsDoc.getElements();
+    
+    // Filter for selected elements
+    const selectedElements = elements.filter(element => 
+      this.selectedElementIds.includes(element.id)
+    );
+    
+    // Rotate each selected element
+    selectedElements.forEach(element => {
+      // Calculate new rotation (add rotation angle, wrapping at 360 degrees)
+      let newRotation = element.properties.rotation || 0;
+      newRotation = (newRotation + this.rotationAngle) % 360;
+      
+      // Update element with new rotation property
+      this.yjsDoc.updateElement(element.id, {
+        properties: {
+          ...element.properties,
+          rotation: newRotation
+        }
+      });
+    });
+  }
+
+  // Set selected elements
+  setSelectedElements(elementIds: string[]): void {
+    this.selectedElementIds = elementIds;
+  }
+
+  // Set rotation angle
+  setRotationAngle(angle: number): void {
+    this.rotationAngle = angle;
+  }
+}
+
+export { RotateSeatingGroupTool };