fix(hub): remove stale smart_devices records when a drive is no longer reported (#2178)

* Fix duplicate /dev/sdg-style entries

* only prune devices after complete refreshes

---------

Co-authored-by: henrygd <hank@henrygd.me>

internal/hub/transport/transport_test.go

@@ -0,0 +1,33 @@
+package transport
+
+import (
+	"testing"
+
+	"github.com/henrygd/beszel/internal/common"
+	"github.com/henrygd/beszel/internal/entities/smart"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestUnmarshalSmartDataResponse(t *testing.T) {
+	for _, test := range []struct {
+		name     string
+		complete bool
+	}{
+		{name: "complete response", complete: true},
+		{name: "older agent defaults to incomplete", complete: false},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			response := common.AgentResponse{
+				SmartData: map[string]smart.SmartData{
+					"AAA": {SerialNumber: "AAA"},
+				},
+				SmartComplete: test.complete,
+			}
+			var result smart.SmartDataResponse
+			require.NoError(t, UnmarshalResponse(response, common.GetSmartData, &result))
+			assert.Equal(t, test.complete, result.Complete)
+			assert.Equal(t, "AAA", result.Data["AAA"].SerialNumber)
+		})
+	}
+}