FEAT: Implement deceased/givenaway enclosure visibility rules, preserve external clan name, and hide receiver fields for deceased gerbils

gerbil-manager-web/src/components/charakterbogen.css

@@ -65,3 +65,54 @@
   color: #d97706;
   white-space: nowrap;
 }
+
+/* Collapsible details styling for the Charakter & Eigenschaften section */
+.charakter-details {
+  border: 1px solid var(--color-border, #ddd);
+  border-radius: 8px;
+  background: var(--color-surface, #fff);
+  margin-top: 1.5rem;
+  margin-bottom: 1.5rem;
+  overflow: hidden;
+}
+
+.charakter-summary {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 1rem 1.25rem;
+  cursor: pointer;
+  list-style: none;
+  user-select: none;
+  background: var(--color-accent-soft, #f9f9f9);
+  transition: background 0.2s ease;
+}
+
+.charakter-summary::-webkit-details-marker {
+  display: none;
+}
+
+.charakter-summary:hover {
+  background: var(--color-hover, #f5f5f5);
+}
+
+.charakter-summary h3 {
+  margin: 0;
+  font-size: 1.25rem;
+  color: var(--color-text, #333);
+}
+
+.charakter-chevron {
+  font-size: 1.1rem;
+  transition: transform 0.2s ease;
+  flex-shrink: 0;
+}
+
+.charakter-details[open] > .charakter-summary .charakter-chevron {
+  transform: rotate(180deg);
+}
+
+.charakter-body {
+  padding: 1.25rem;
+  border-top: 1px solid var(--color-border, #ddd);
+}