feat: add completion_date field to projects and update related functionalities in forms and queries

src/app/projects/[id]/page.js

@@ -405,6 +405,16 @@ export default function ProjectViewPage() {
 									currentValue={project.finish_date}
 									label="Termin zakończenia"
 								/>
+								{project.completion_date && (
+									<div>
+										<span className="text-sm font-medium text-gray-500 block mb-1">
+											Data zakończenia projektu
+										</span>
+										<p className="text-gray-900 font-medium">
+											{formatDate(project.completion_date)}
+										</p>
+									</div>
+								)}
 								<div>
 									<span className="text-sm font-medium text-gray-500 block mb-1">
 										WP