Ergänzt Prozentregler für die responsive Bildbreite

public/assets/editor.css

@@ -311,3 +311,6 @@ dialog p{font-size:14px;line-height:1.7;color:var(--muted)}
 @media(max-width:560px){.left-panel,.right-panel{width:100%;height:620px;max-height:620px}.canvas-toolbar{padding-inline:8px}.canvas-label{display:none}}
 
 .canvas-toolbar{flex-wrap:wrap;gap:8px}.canvas-toolbar #preview-motion{white-space:nowrap;min-height:36px}
+.image-width-control{padding:14px;margin-bottom:20px;border:1px solid var(--line);border-radius:10px;background:#f5f8f1}
+.image-width-control>label{margin-top:0}.image-width-inputs{display:grid;grid-template-columns:minmax(0,1fr) 76px;align-items:center;gap:12px}
+.image-width-inputs input[type=range]{width:100%;min-width:0;margin:0;padding:0;accent-color:var(--accent);min-height:36px}.image-width-control .field-help{margin:8px 0}.image-width-control .text-button{margin-top:4px}.image-width-error{color:#a62424}