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>
+            @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');
   }

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(