Calcule du temps estimé des Milestone et Epic

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

@@ -186,7 +186,11 @@
         <div class="row g-2">
           <div [class]="isEpicIssue ? 'col-12' : 'col-6'">
             <label class="field-label">Temps estimé (h)</label>
-            <input aria-label="Temps estimé" class="form-control form-control-sm" type="number" min="0" step="0.5" [(ngModel)]="estimatedTimeValue" (blur)="saveIssue()" />
+            @if (isEpicIssue) {
+              <div class="form-control form-control-sm bg-body-secondary text-secondary">{{ epicEstimatedTime !== null ? epicEstimatedTime : '—' }}</div>
+            } @else {
+              <input aria-label="Temps estimé" class="form-control form-control-sm" type="number" min="0" step="0.5" [(ngModel)]="estimatedTimeValue" (blur)="saveIssue()" />
+            }
           </div>
           @if (!isEpicIssue) {
             <div class="col-6">

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

@@ -580,6 +580,39 @@ describe('IssueDetail — existing issue', () => {
     });
   });
 
+  describe('epicEstimatedTime', () => {
+    beforeEach(() => {
+      (component as any).issue.type = 'Epic';
+      (component as any).issue.name = 'Test Epic';
+    });
+
+    it('returns null when there are no child issues', () => {
+      expect((component as any).epicEstimatedTime).toBeNull();
+    });
+
+    it('returns null when all children have null estimatedTime', () => {
+      store.upsert(makeIssue({ id: 200, epic: 'Test Epic', estimatedTime: null }));
+      expect((component as any).epicEstimatedTime).toBeNull();
+    });
+
+    it('returns the sum of children estimatedTime', () => {
+      store.upsert(makeIssue({ id: 200, epic: 'Test Epic', estimatedTime: 8 }));
+      store.upsert(makeIssue({ id: 201, epic: 'Test Epic', estimatedTime: 4 }));
+      expect((component as any).epicEstimatedTime).toBe(12);
+    });
+
+    it('ignores children with null estimatedTime in the sum', () => {
+      store.upsert(makeIssue({ id: 200, epic: 'Test Epic', estimatedTime: 8 }));
+      store.upsert(makeIssue({ id: 201, epic: 'Test Epic', estimatedTime: null }));
+      expect((component as any).epicEstimatedTime).toBe(8);
+    });
+
+    it('includes children linked via dependsOnIds', () => {
+      store.upsert(makeIssue({ id: 200, dependsOnIds: [1], estimatedTime: 6 }));
+      expect((component as any).epicEstimatedTime).toBe(6);
+    });
+  });
+
   describe('create-in-epic flow', () => {
     beforeEach(() => {
       (component as any).issue.type = 'Epic';

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

@@ -150,6 +150,13 @@ export class IssueDetail {
     this.issue.type = value;
   }
 
+  protected get epicEstimatedTime(): number | null {
+    const times = this.composedIssues
+      .filter((i): i is IssueEntity & { estimatedTime: number } => i.estimatedTime !== null)
+      .map((i) => i.estimatedTime);
+    return times.length === 0 ? null : times.reduce((a, b) => a + b, 0);
+  }
+
   protected get epicIssues(): IssueEntity[] {
     return this.issues().filter((issue) => issue.type === 'Epic');
   }