Refactor layout and styling: update HTML structure and apply Bootstrap for improved responsiveness

src/app/issues/issues.store.ts

@@ -88,25 +88,6 @@ export class IssuesStore {
     return ids.length > 0 ? Math.max(...ids) + 1 : 1;
   }
 
-  createDraftIssue(): IssueEntity {
-    const draftIssue: IssueEntity = this.normalizeIssue({
-      id: this.getNextId(),
-      type: 'Story',
-      assignee: '',
-      epic: '',
-      name: '',
-      dueDate: '',
-      description: '',
-      estimatedTime: null,
-      dependsOnIds: [],
-      priority: 'Moyenne',
-      status: 'draft',
-      progress: 0,
-    });
-
-    this.upsert(draftIssue);
-    return draftIssue;
-  }
 
   upsert(issue: IssueEntity): void {
     const normalizedIssue = this.normalizeIssue(issue);