feat: Add BOM tree view and BOM item editor components

- Introduced new components for BOM tree view and BOM item editor, enhancing the data management capabilities within the application.
- Updated the ComponentsPanel to include these new components with appropriate descriptions and default sizes.
- Integrated the BOM item editor into the V2PropertiesPanel for seamless editing of BOM items.
- Adjusted the SplitLineComponent to improve the handling of canvas split positions, ensuring better user experience during component interactions.

frontend/lib/registry/components/v2-split-line/SplitLineComponent.tsx

@@ -123,8 +123,8 @@ export const SplitLineComponent: React.FC<SplitLineComponentProps> = ({
       const startOffset = dragOffset;
       const scaleFactor = getScaleFactor();
       const cw = detectCanvasWidth();
-      const MIN_POS = 50;
-      const MAX_POS = cw - 50;
+      const MIN_POS = Math.max(50, cw * 0.15);
+      const MAX_POS = cw - Math.max(50, cw * 0.15);
 
       setIsDragging(true);
       setCanvasSplit({ isDragging: true });