feat: Notifications page, Sidebar layout fixes, and Achievements enhancements

- implemented /notifications page with overdue/upcoming alerts
- Fixed sidebar scrolling in collapsed mode
- Moved notification button to sidebar footer
- Enhanced Achievements page with streak stats and tooltips
- Improved XP history to show task titles
- Added missing translations (en/de)
- Removed top bar header
- Fixed Docker environment routing

client/src/components/TaskCard.tsx

@@ -17,8 +17,9 @@ import {
   ContextMenuSeparator,
   ContextMenuTrigger,
 } from "@/components/ui/context-menu";
-import { Clock, Calendar, Play, Pause, MoreHorizontal, Edit, Trash2, Timer, CheckCircle, X, Lock, CornerDownRight } from "lucide-react";
-import { Task, Label } from '@shared/schema';
+import { Clock, Calendar, Play, Pause, MoreHorizontal, Edit, Trash2, Timer, CheckCircle, X, Lock, CornerDownRight, Share2, Users } from "lucide-react";
+import { Task, Label, User } from '@shared/schema';
+import { ShareTaskModal } from './ShareTaskModal';
 import { useQuery } from '@tanstack/react-query';
 import { Checkbox } from "@/components/ui/checkbox";
 import { motion, PanInfo, useAnimation } from 'framer-motion';
@@ -47,10 +48,6 @@ interface TaskCardProps {
   isDragging?: boolean;
 }
 
-import { ShareTaskModal } from './ShareTaskModal';
-import { Share2, Users } from "lucide-react";
-import { User } from "@shared/schema";
-
 function SharedTaskIcon({ task }: { task: Task }) {
   const { t } = useTranslation();
   const { data: user } = useQuery<User>({ queryKey: ["/api/user"], retry: false });