Modification ajoute de dépendence

src/app/issues/issue-detail/issue-detail.css

@@ -146,8 +146,61 @@
   background-color: #f3f4f6;
 }
 
-.dependency-multiselect {
-  min-height: 8rem;
+.dependency-list {
+  list-style: none;
+  margin: 0 0 0.5rem;
+  padding: 0;
+  display: flex;
+  flex-direction: column;
+  gap: 0.35rem;
+}
+
+.dependency-item {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 0.5rem;
+  padding: 0.3rem 0.6rem;
+  border: 1px solid #e5e7eb;
+  border-radius: 0.4rem;
+  background: #f9fafb;
+}
+
+.dependency-label {
+  font-size: 0.875rem;
+  color: #374151;
+}
+
+.dependency-remove {
+  flex-shrink: 0;
+  border: none;
+  background: transparent;
+  color: #9ca3af;
+  font-size: 1.1rem;
+  line-height: 1;
+  cursor: pointer;
+  padding: 0 0.15rem;
+  border-radius: 0.25rem;
+}
+
+.dependency-remove:hover {
+  color: #b91c1c;
+  background: #fee2e2;
+}
+
+.dependency-add-btn {
+  margin-top: 0.25rem;
+}
+
+.dependency-add-row {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  margin-top: 0.25rem;
+}
+
+.dependency-select {
+  flex: 1;
 }
 
 .epic-issues-card {