feat: add transfer panel to dashboard + remove PERBAIKANUI.md

- Add Background Transfers section with mock download/upload rows
- Progress bars with green glow shadow, source/destination layout
- Empty state when no transfers active
- Delete PERBAIKANUI.md (all UI tasks complete)

app/backend/internal/handler/dashboard.go

@@ -21,13 +21,18 @@ var navItems = []fiber.Map{
 
 func Dashboard(c *fiber.Ctx) error {
 	hosts := hostStore.All()
+	transfers := []model.Transfer{
+		{ID: "1", FileName: "backup_v4.tar.gz", Source: "production-api-01", Destination: "Local Machine", Progress: 82, Speed: "12.4 MB/s", Type: "download", Status: "transferring"},
+		{ID: "2", FileName: "assets_deploy.zip", Source: "Local Storage", Destination: "web-frontend-02", Progress: 35, Speed: "4.8 MB/s", Type: "upload", Status: "transferring"},
+	}
 	return c.Render("index", fiber.Map{
-		"View":     "hosts",
-		"Title":    "Hosts",
-		"Hosts":    hosts,
-		"Active":   countByStatus(hosts, "active"),
-		"Offline":  countByStatus(hosts, "offline"),
-		"NavItems": navItems,
+		"View":      "hosts",
+		"Title":     "Hosts",
+		"Hosts":     hosts,
+		"Active":    countByStatus(hosts, "active"),
+		"Offline":   countByStatus(hosts, "offline"),
+		"NavItems":  navItems,
+		"Transfers": transfers,
 	})
 }