# T10 Izveštaj: Drag & Drop — premesti task prevlačenjem

**Agent:** coder
**Model:** Opus
**Datum:** 2026-02-20

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## Šta je urađeno

Dodat Sortable.js drag & drop na Kanban board sa server-side validacijom:

### Izmenjeni fajlovi

| Fajl | Izmena |
|------|--------|
| `web/templates/layout.html` | Sortable.js script, initSortable(), toast notifikacije |
| `web/templates/partials/column.html` | column-tasks div sa data-folder atributom |
| `web/static/style.css` | Ghost, chosen, drag stilovi, toast, flash animacije |
| `internal/server/server.go` | allowedMoves mapa, isMoveAllowed(), 403 za zabranjene poteze |
| `internal/server/server_test.go` | 7 novih testova za validaciju i D&D |

### Pravila premještanja (server validira)

| Dozvoljeno | Zabranjeno |
|-----------|------------|
| backlog → ready | ready → active (samo agent) |
| ready → backlog | active → review (samo agent) |
| review → done | backlog → done |
| review → ready | backlog → active |
| done → review | done → backlog |

### Vizuelni feedback

- Ghost: poluprozirna kartica sa dashed borderom
- Chosen: shadow efekat
- Drag: blaga rotacija
- Toast: zeleni za uspeh, crveni za grešku
- Board se automatski osvežava posle svakog poteza

### Testovi — 23/23 PASS (server)

Novi testovi:
```
TestAPIMoveTask_ForbiddenToActive       PASS
TestAPIMoveTask_ForbiddenActiveToReview PASS
TestAPIMoveTask_AllowedBacklogToReady   PASS
TestAPIMoveTask_AllowedReviewToDone     PASS
TestDashboardHTML_HasSortableScript     PASS
TestDashboardHTML_HasDataFolderAttributes PASS
TestIsMoveAllowed                       PASS
```

### Ukupno projekat: 90 testova, svi prolaze

- `go vet ./...` — čist
- `go build ./...` — prolazi