Enable keyboard delete in layers panel

Added keyboard event listener to allow deleting selected layers using the Delete or Backspace keys when the layers panel is focused. This improves accessibility and user experience.

js/CanvasLayersPanel.js

@@ -29,6 +29,7 @@ export class CanvasLayersPanel {
         // Główny kontener panelu
         this.container = document.createElement('div');
         this.container.className = 'layers-panel';
+        this.container.tabIndex = 0; // Umożliwia fokus na panelu
         this.container.innerHTML = `
             <div class="layers-panel-header">
                 <span class="layers-panel-title">Layers</span>
@@ -48,6 +49,15 @@ export class CanvasLayersPanel {
         
         // Setup event listeners dla przycisków
         this.setupControlButtons();
+
+        // Dodaj listener dla klawiatury, aby usuwanie działało z panelu
+        this.container.addEventListener('keydown', (e) => {
+            if (e.key === 'Delete' || e.key === 'Backspace') {
+                e.preventDefault();
+                e.stopPropagation();
+                this.deleteSelectedLayers();
+            }
+        });
         
         log.debug('Panel structure created');
         return this.container;