Calcule du temps estimé des Milestone et Epic

src/app/milestones/milestone-detail/milestone-detail.html

@@ -94,6 +94,10 @@
             <span class="text-secondary small" style="min-width: 2.5rem; text-align: right;">{{ progress }}%</span>
           </div>
         </div>
+        <div class="col-md-4">
+          <label class="field-label">Temps estimé total (h)</label>
+          <div class="form-control form-control-sm bg-body-secondary text-secondary">{{ totalEstimatedTime !== null ? totalEstimatedTime : '—' }}</div>
+        </div>
       }
     </div>
   </div>

src/app/milestones/milestone-detail/milestone-detail.spec.ts

@@ -580,6 +580,69 @@ describe('MilestoneDetail', () => {
       expect((component as any).milestone.description).toContain('![image]');
     });
   });
+
+  describe('totalEstimatedTime', () => {
+    it('returns null when no linked issues', () => {
+      issuesStore.seed([]);
+      (component as any).milestone.issueIds = [];
+      expect((component as any).totalEstimatedTime).toBeNull();
+    });
+
+    it('returns null when all linked issues have null estimatedTime', () => {
+      issuesStore.seed([
+        makeIssue({ id: 1, estimatedTime: null }),
+        makeIssue({ id: 2, estimatedTime: null }),
+      ]);
+      (component as any).milestone.issueIds = [1, 2];
+      expect((component as any).totalEstimatedTime).toBeNull();
+    });
+
+    it('returns the sum of estimatedTime for non-Epic issues', () => {
+      issuesStore.seed([
+        makeIssue({ id: 1, estimatedTime: 8 }),
+        makeIssue({ id: 2, estimatedTime: 4 }),
+      ]);
+      (component as any).milestone.issueIds = [1, 2];
+      expect((component as any).totalEstimatedTime).toBe(12);
+    });
+
+    it('ignores null estimatedTime in the sum', () => {
+      issuesStore.seed([
+        makeIssue({ id: 1, estimatedTime: 8 }),
+        makeIssue({ id: 2, estimatedTime: null }),
+      ]);
+      (component as any).milestone.issueIds = [1, 2];
+      expect((component as any).totalEstimatedTime).toBe(8);
+    });
+
+    it('uses the Epic own estimatedTime, not its children', () => {
+      issuesStore.seed([
+        makeIssue({ id: 1, type: 'Epic', name: 'My Epic', estimatedTime: 10 }),
+        makeIssue({ id: 2, epic: 'My Epic', estimatedTime: 5 }),
+        makeIssue({ id: 3, epic: 'My Epic', estimatedTime: 3 }),
+      ]);
+      (component as any).milestone.issueIds = [1];
+      expect((component as any).totalEstimatedTime).toBe(10);
+    });
+
+    it('returns null for an Epic with null estimatedTime', () => {
+      issuesStore.seed([
+        makeIssue({ id: 1, type: 'Epic', name: 'My Epic', estimatedTime: null }),
+        makeIssue({ id: 2, epic: 'My Epic', estimatedTime: 5 }),
+      ]);
+      (component as any).milestone.issueIds = [1];
+      expect((component as any).totalEstimatedTime).toBeNull();
+    });
+
+    it('mixes Epics and plain issues correctly', () => {
+      issuesStore.seed([
+        makeIssue({ id: 1, type: 'Epic', name: 'My Epic', estimatedTime: 8 }),
+        makeIssue({ id: 3, type: 'Story', estimatedTime: 6 }),
+      ]);
+      (component as any).milestone.issueIds = [1, 3];
+      expect((component as any).totalEstimatedTime).toBe(14);
+    });
+  });
 });
 
 describe('MilestoneDetail — new route', () => {

src/app/milestones/milestone-detail/milestone-detail.ts

@@ -110,6 +110,13 @@ export class MilestoneDetail {
     return tasks;
   }
 
+  protected get totalEstimatedTime(): number | null {
+    const times = this.linkedIssues
+      .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 progress(): number {
     if (this.linkedIssues.length === 0) return 0;
     return Math.round(