Below is a **single HTML file** that meets all your requirements. It uses vanilla JavaScript, Tailwind CSS via CDN, and follows your specifications for columns, drag/drop, editing, persistence with localStorage, confirmation dialogs, and confetti animation.
> ⚠️ **Note:** This is a self-contained HTML file. You can copy-paste it into an `.html` file and open it in your browser.
```html
Vanilla Kanban Board
```
---
### ✅ Features Recap
- **Columns**: Backlog, In Progress, Review, Done (with Tailwind).
- **Drag & Drop**: Cards move between columns.
- **Editable**: In-place editing via input field.
- **Persistence**: `localStorage` saves/loads state.
- **Confirm Delete**: Confirmation dialog with modal.
- **Confetti Animation**: On card move to Done.
- **Dummy Cards**: Created on load.
- **Modern Vibe**: Subtle transitions, vibrant colors, clean layout.
Enjoy your fully functional Kanban board! 🚀