Gantt chart doesn't extend to 5 weeks out from any wp without time info

Author: chpy04

src/frontend/src/utils/gantt.utils.tsx

@@ -134,28 +134,21 @@ export type RequestEventChange<T> = {
 };
 
 export const getProjectStartDate = (project: ProjectGantt): Date => {
-  const wpStart = project.workPackages.reduce((acc, current) => {
-    if (current.startDate < acc) return current.startDate;
-    return acc;
-  }, new Date());
-  return project.tasks.reduce((acc, current) => {
-    if (current.startDate && current.startDate < acc) return current.startDate;
-    return acc;
-  }, wpStart);
+  const candidates: Date[] = [
+    ...project.workPackages.map((wp) => wp.startDate),
+    ...project.tasks.map((t) => t.startDate).filter((d): d is Date => !!d)
+  ];
+  if (candidates.length === 0) return project.startDate ?? new Date();
+  return new Date(Math.min(...candidates.map((d) => d.valueOf())));
 };
 
 export const getProjectEndDate = (project: ProjectGantt): Date => {
-  const wpEnd = project.workPackages.reduce(
-    (acc, current) => {
-      if (current.endDate > acc) return current.endDate;
-      return acc;
-    },
-    new Date(Date.now() + 1000 * 60 * 60 * 24 * 7 * 5)
-  );
-  return project.tasks.reduce((acc, current) => {
-    if (current.deadline && current.deadline > acc) return current.deadline;
-    return acc;
-  }, wpEnd);
+  const candidates: Date[] = [
+    ...project.workPackages.map((wp) => wp.endDate),
+    ...project.tasks.map((t) => t.deadline).filter((d): d is Date => !!d)
+  ];
+  if (candidates.length === 0) return project.endDate ?? new Date();
+  return new Date(Math.max(...candidates.map((d) => d.valueOf())));
 };
 
 export const transformDesignReviewEventToGanttEvent = (event: EventPreview): GanttEvent => {