Add WebDAV lifecycle UI feedback

main_test.go

@@ -478,6 +478,99 @@ func TestUIOpenRemoteAndSaveThroughConfiguredWebDAVTarget(t *testing.T) {
 	}
 }
 
+func TestUIOpenRemoteReportsTransportFailure(t *testing.T) {
+	t.Parallel()
+
+	server := httptest.NewServer(http.HandlerFunc(func(http.ResponseWriter, *http.Request) {}))
+	url := server.URL
+	server.Close()
+
+	u := newUIWithSession("desktop", &session.Manager{})
+	u.masterPassword.SetText("correct horse battery staple")
+	u.remoteBaseURL.SetText(url)
+	u.remotePath.SetText("vaults/main.kdbx")
+
+	u.runAction("open remote vault", u.openRemoteAction)
+
+	if got := u.errorMessage; !strings.Contains(got, "open remote vault failed:") {
+		t.Fatalf("errorMessage = %q, want open remote vault failure", got)
+	}
+	if got := u.statusMessage; got != "" {
+		t.Fatalf("statusMessage = %q, want empty on remote open failure", got)
+	}
+}
+
+func TestUIRemoteSaveConflictShowsVisibleErrorAndKeepsDirtyState(t *testing.T) {
+	t.Parallel()
+
+	key := vault.MasterKey{Password: "correct horse battery staple"}
+	model := vault.Model{
+		Entries: []vault.Entry{
+			{
+				ID:       "vault-console",
+				Title:    "Vault Console",
+				Username: "dannyocean",
+				Password: "token-1",
+				URL:      "https://vault.crew.example.invalid",
+				Path:     []string{"Root", "Internet"},
+			},
+		},
+	}
+
+	var putCount int
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.Method {
+		case http.MethodGet:
+			var encoded bytes.Buffer
+			if err := vault.SaveKDBXWithKey(&encoded, model, key); err != nil {
+				t.Fatalf("SaveKDBXWithKey() error = %v", err)
+			}
+			w.Header().Set("ETag", "\"v1\"")
+			_, _ = w.Write(encoded.Bytes())
+		case http.MethodPut:
+			putCount++
+			w.WriteHeader(http.StatusPreconditionFailed)
+		default:
+			t.Fatalf("unexpected method %s", r.Method)
+		}
+	}))
+	defer server.Close()
+
+	u := newUIWithSession("desktop", &session.Manager{})
+	u.masterPassword.SetText("correct horse battery staple")
+	u.remoteBaseURL.SetText(server.URL)
+	u.remotePath.SetText("vaults/main.kdbx")
+
+	if err := u.openRemoteAction(); err != nil {
+		t.Fatalf("openRemoteAction() error = %v", err)
+	}
+	if err := u.state.UpsertEntry(vault.Entry{
+		ID:       "vault-console",
+		Title:    "Vault Console",
+		Username: "dannyocean",
+		Password: "token-2",
+		URL:      "https://vault.crew.example.invalid",
+		Path:     []string{"Root", "Internet"},
+	}); err != nil {
+		t.Fatalf("UpsertEntry() error = %v", err)
+	}
+
+	u.runAction("save vault", u.saveAction)
+
+	if got := u.errorMessage; !strings.Contains(got, "remote vault changed on the server") {
+		t.Fatalf("errorMessage = %q, want visible remote conflict guidance", got)
+	}
+	if got := u.statusMessage; got != "" {
+		t.Fatalf("statusMessage = %q, want empty after remote save conflict", got)
+	}
+	if !u.state.Dirty {
+		t.Fatal("Dirty = false, want true after remote save conflict")
+	}
+	if putCount != 1 {
+		t.Fatalf("remote PUT count = %d, want 1", putCount)
+	}
+}
+
 func TestUIMasterKeyInputSupportsKeyFileAndCompositeKeys(t *testing.T) {
 	t.Parallel()