fix: project edit status dropdown empty for projects with blank status

Use || instead of ?? so empty string '' falls back to 'SUBMITTED'.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/(admin)/admin/projects/[id]/edit/page.tsx

@@ -205,7 +205,7 @@ function EditProjectContent({ projectId }: { projectId: string }) {
         title: project.title,
         teamName: project.teamName || '',
         description: project.description || '',
-        status: (project.status ?? 'SUBMITTED') as UpdateProjectForm['status'],
+        status: (project.status || 'SUBMITTED') as UpdateProjectForm['status'],
         tags: project.tags || [],
         competitionCategory: project.competitionCategory || '',
         oceanIssue: project.oceanIssue || '',