Add Epic issue type and enhance issue detail display with epic-related information

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

@@ -150,6 +150,78 @@
   min-height: 8rem;
 }
 
+.epic-issues-card {
+  margin-top: 1rem;
+  background-color: #ffffff;
+  border: 1px solid #e5e7eb;
+  border-radius: 0.75rem;
+  padding: 1rem;
+}
+
+.epic-issues-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 1rem;
+  margin-bottom: 1rem;
+}
+
+.epic-issues-header h2 {
+  margin: 0;
+  font-size: 1.1rem;
+}
+
+.epic-issues-header span {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  min-width: 2rem;
+  padding: 0.2rem 0.5rem;
+  border-radius: 999px;
+  background: #dbeafe;
+  color: #1d4ed8;
+  font-weight: 700;
+}
+
+.epic-empty {
+  margin: 0;
+  color: #6b7280;
+}
+
+.epic-issues-list {
+  list-style: none;
+  margin: 0;
+  padding: 0;
+  display: grid;
+  gap: 0.75rem;
+}
+
+.epic-issue-item {
+  display: flex;
+  justify-content: space-between;
+  gap: 1rem;
+  padding: 0.85rem 1rem;
+  border: 1px solid #e5e7eb;
+  border-radius: 0.75rem;
+  background: #f9fafb;
+}
+
+.epic-issue-item strong,
+.epic-issue-item p {
+  display: block;
+}
+
+.epic-issue-item p {
+  margin: 0.25rem 0 0;
+  color: #6b7280;
+}
+
+.epic-issue-item span {
+  color: #374151;
+  font-weight: 600;
+  white-space: nowrap;
+}
+
 .detail-card {
   background-color: #ffffff;
   border: 1px solid #e5e7eb;

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

@@ -56,12 +56,19 @@
           </select>
         </td>
       </tr>
-      <tr>
+      @if (!isEpicIssue) {
-        <th>Epic</th>
+        <tr>
-        <td>
+          <th>Epic</th>
-          <input type="text" [(ngModel)]="issue.epic" (blur)="saveIssue()" />
+          <td>
-        </td>
+            <select [(ngModel)]="issue.epic" (change)="saveIssue()">
-      </tr>
+              <option value="">-</option>
+              @for (epicIssue of epicIssues; track epicIssue.id) {
+                <option [value]="epicIssue.name">{{ epicIssue.name }}</option>
+              }
+            </select>
+          </td>
+        </tr>
+      }
       <tr>
         <th>Depend de</th>
         <td>
@@ -118,4 +125,29 @@
   </table>
 </section>
 
+@if (isEpicIssue) {
+  <section class="epic-issues-card" aria-label="Issues composant cet epic">
+    <div class="epic-issues-header">
+      <h2>Issues composant cet Epic</h2>
+      <span>{{ composedIssues.length }}</span>
+    </div>
+
+    @if (composedIssues.length === 0) {
+      <p class="epic-empty">Aucune issue ne compose encore cet Epic.</p>
+    } @else {
+      <ul class="epic-issues-list">
+        @for (composedIssue of composedIssues; track composedIssue.id) {
+          <li class="epic-issue-item">
+            <div>
+              <strong>#{{ composedIssue.id }} - {{ composedIssue.name || 'Sans nom' }}</strong>
+              <p>{{ composedIssue.type }} · {{ composedIssue.status }}</p>
+            </div>
+            <span>{{ composedIssue.assignee || 'Non assigné' }}</span>
+          </li>
+        }
+      </ul>
+    }
+  </section>
+}
+
 

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

@@ -27,6 +27,7 @@ export class IssueDetail {
   ];
 
   protected readonly typeOptions: IssueEntity['type'][] = [
+    'Epic',
     'Bug',
     'Study',
     'Story',
@@ -59,6 +60,18 @@ export class IssueDetail {
     this.issue.type = value;
   }
 
+  protected get epicIssues(): IssueEntity[] {
+    return this.issues().filter((issue) => issue.type === 'Epic');
+  }
+
+  protected get composedIssues(): IssueEntity[] {
+    return this.issues().filter((issue) => issue.dependsOnIds.includes(this.issue.id));
+  }
+
+  protected get isEpicIssue(): boolean {
+    return this.issueTypeValue === 'Epic';
+  }
+
   protected saveIssue(): void {
     this.issuesStore.upsert(this.issue);
     if (this.isNewIssueRoute) {

src/app/issues/issues.store.ts

@@ -4,7 +4,7 @@ const ISSUES_STORAGE_KEY = 'bonsai.issues';
 
 export type IssueStatus = 'draft' | 'todo' | 'done' | 'in-progress';
 export type IssuePriority = 'Basse' | 'Moyenne' | 'Haute';
-export type IssueType = 'Bug' | 'Study' | 'Story' | 'Technical Story';
+export type IssueType = 'Epic' | 'Bug' | 'Study' | 'Story' | 'Technical Story';
 
 export type IssueEntity = {
   id: number;