feat: intercept Cmd+P to print PagedJS preview

Override default print behavior to print the active iframe
content (PagedJS rendered preview) instead of the main page.
Works with both Cmd+P (Mac) and Ctrl+P (Windows/Linux).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/App.vue

@@ -4,7 +4,7 @@ import EditorPanel from './components/editor/EditorPanel.vue';
 import ElementPopup from './components/ElementPopup.vue';
 import PagePopup from './components/PagePopup.vue';
 import PreviewLoader from './components/PreviewLoader.vue';
-import { onMounted, ref, watch, computed, provide } from 'vue';
+import { onMounted, onUnmounted, ref, watch, computed, provide } from 'vue';
 import { useStylesheetStore } from './stores/stylesheet';
 import Coloris from '@melloware/coloris';
 
@@ -274,7 +274,25 @@ watch(
   }
 );
 
-onMounted(() => renderPreview(true));
+// Handle Cmd+P / Ctrl+P to print the iframe content
+const handlePrint = (event) => {
+  if ((event.metaKey || event.ctrlKey) && event.key === 'p') {
+    event.preventDefault();
+    const frame = activeFrame.value;
+    if (frame && frame.contentWindow) {
+      frame.contentWindow.print();
+    }
+  }
+};
+
+onMounted(() => {
+  renderPreview(true);
+  window.addEventListener('keydown', handlePrint);
+});
+
+onUnmounted(() => {
+  window.removeEventListener('keydown', handlePrint);
+});
 </script>
 
 <template>