task(CAD-10): ribbon curation - 4 tabs (Start/Zeichnen/Ansicht/KI) statt 7, logische Werkzeug-Gruppen, Traversen+Stueckliste zusammen, Duplikate entfernt

frontend/src/styles.css

@@ -3077,3 +3077,46 @@ body.drawer-open { overflow: hidden; }
   color: #fff;
   border-color: rgba(255, 255, 255, 0.3);
 }
+
+/* ─── CAD-10: Zeichnen-Tab V2-Buttons ─── */
+.ribbon-draw-content {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 4px;
+  padding: 4px 0;
+  width: 100%;
+}
+.ribbon-v2-btn {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 2px;
+  min-width: 52px;
+  padding: 6px 8px;
+  background: transparent;
+  border: 1px solid transparent;
+  border-radius: 6px;
+  cursor: pointer;
+  color: var(--color-text, #d0d0d0);
+}
+.ribbon-v2-btn:hover {
+  background: rgba(255, 255, 255, 0.06);
+  border-color: rgba(255, 255, 255, 0.12);
+}
+.ribbon-v2-btn.active {
+  background: rgba(74, 144, 217, 0.15);
+  border-color: rgba(74, 144, 217, 0.5);
+}
+.ribbon-v2-icon {
+  font-size: 14px;
+  line-height: 1;
+}
+.ribbon-v2-label {
+  font-size: 9px;
+  color: var(--color-text-secondary, #9aa0a6);
+  text-align: center;
+  white-space: nowrap;
+}
+.ribbon-v2-btn.active .ribbon-v2-label {
+  color: #4a90d9;
+}