Refactor project tasks page and navigation components

- Updated the description in ProjectTasksPage to a placeholder.
- Commented out the display of assigned email in ProjectTasksList.
- Removed the dashboard link from the navigation items.
- Changed the main link in the navigation to point to projects instead of the dashboard.
- Commented out the LanguageSwitcher and user role display in the navigation.
- Translated "Project Location" to "Lokalizacja projektu" in ProjectMap.
- Commented out the instruction for using the layer control in ProjectMap.
- Removed the label "Coordinates:" from the coordinates display in ProjectMap.
- Updated project and contract subtitles in translations to placeholders.
- Added a new empty validation schema file.

src/components/ui/Navigation.js

@@ -21,7 +21,6 @@ const Navigation = () => {
 	};
 
 	const navItems = [
-		{ href: "/", label: t('navigation.dashboard') },
 		{ href: "/projects", label: t('navigation.projects') },
 		{ href: "/tasks/templates", label: t('navigation.taskTemplates') },
 		{ href: "/project-tasks", label: t('navigation.projectTasks') },
@@ -47,7 +46,7 @@ const Navigation = () => {
 			<div className="max-w-6xl mx-auto px-6">
 				<div className="flex items-center justify-between h-16">
 					<div className="flex items-center">
-						<Link href="/" className="text-xl font-bold text-gray-900">
+						<Link href="/projects" className="text-xl font-bold text-gray-900">
 							{t('navigation.projectPanel')}
 						</Link>
 					</div>
@@ -74,12 +73,12 @@ const Navigation = () => {
 								</div>
 								
 								<div className="flex items-center space-x-4 ml-8 pl-8 border-l border-gray-200">
-									<LanguageSwitcher />
+									{/* <LanguageSwitcher /> */}
 									
 									<div className="flex items-center space-x-2">
 										<div className="text-sm">
 											<div className="font-medium text-gray-900">{session.user.name}</div>
-											<div className="text-gray-500 capitalize">{t(`userRoles.${session.user.role}`) || session.user.role?.replace('_', ' ')}</div>
+											{/* <div className="text-gray-500 capitalize">{t(`userRoles.${session.user.role}`) || session.user.role?.replace('_', ' ')}</div> */}
 										</div>
 									</div>