feat(ui): enhance frontend architecture and improve user experience

Refactor the frontend to use a more consistent design system and improve the overall user interface and experience.

- Implement a consistent use of `Card` components across various pages (Dashboard, Settings, Notes, etc.).
- Improve layout responsiveness and spacing in several modules.
- Enhance the Tasks page with drag-and-drop status updates and a Kanban-style view.
- Update the Calendar view with better color coding for task priorities and types.
- Refactor the Bookmarks page to use a grid layout with improved card previews.
- Update the Nginx configuration to handle SPA routing and health checks more effectively.
- Standardize import paths using `@/` aliases.
- Fix minor bugs in message sending and loading states.
- Update Docker configuration to build from source and use a specific backend port.

docker-compose.yml

@@ -1,14 +1,13 @@
-icon: https://github.com/Dvorinka/Trackeep/raw/main/trackeepfavi_bg.png
-
 services:
   trackeep:
-    image: ghcr.io/dvorinka/trackeep:latest
+    build:
+      context: .
+      dockerfile: Dockerfile
     ports:
       - "${HOST_PORT:-8080}:8080"
     env_file:
       - .env
     environment:
-      - BACKEND_PORT=8080
       - DB_HOST=postgres
       - DB_PORT=5432
       - GIN_MODE=release