feat(ui): add multi-resolution tray and application branding assets

modules/cybercore-ui/src/main/java/br/com/cybercore/signer/ui/assets/AssetManager.java

@@ -282,6 +282,59 @@ public final class AssetManager {
         return getImageOrDefault("app-logo", width, height, fallbackSupplier);
     }
 
+    private static final int[] ICON_SIZES = {16, 24, 32, 48, 64, 128, 256};
+
+    /**
+     * Retorna a lista de imagens multi-resolução do ícone da aplicação
+     * para configuração do Stage JavaFX principal (16, 24, 32, 48, 64, 128, 256 px).
+     */
+    public static List<Image> getApplicationIcons() {
+        List<Image> icons = new ArrayList<>();
+        for (int size : ICON_SIZES) {
+            String path = "/assets/images/app-icon-" + size + ".png";
+            InputStream in = AssetManager.class.getResourceAsStream(path);
+            if (in != null) {
+                try (in) {
+                    icons.add(new Image(in));
+                } catch (Exception e) {
+                    logger.debug("Falha ao carregar ícone {}: {}", path, e.getMessage());
+                }
+            } else {
+                InputStream fallback = AssetManager.class.getResourceAsStream("/assets/images/app-icon.png");
+                if (fallback != null) {
+                    try (fallback) {
+                        icons.add(new Image(fallback, size, size, true, true));
+                    } catch (Exception ignored) {
+                    }
+                }
+            }
+        }
+        return icons;
+    }
+
+    /**
+     * Carrega a imagem da bandeja do sistema nativa (AWT TrayIcon) em alta fidelidade.
+     */
+    public static java.awt.Image getTrayIconImage() {
+        String[] preferredPaths = {
+            "/assets/images/app-icon-32.png",
+            "/assets/images/app-icon-16.png",
+            "/assets/images/app-icon.png"
+        };
+
+        for (String path : preferredPaths) {
+            InputStream in = AssetManager.class.getResourceAsStream(path);
+            if (in != null) {
+                try (in) {
+                    return javax.imageio.ImageIO.read(in);
+                } catch (Exception e) {
+                    logger.debug("Falha ao ler recurso AWT {}: {}", path, e.getMessage());
+                }
+            }
+        }
+        return null;
+    }
+
     private static String cleanBaseName(String name) {
         String clean = name;
         int dotIdx = clean.lastIndexOf('.');

modules/cybercore-ui/src/main/java/br/com/cybercore/signer/ui/tray/SystemTrayManager.java

@@ -189,9 +189,15 @@ public class SystemTrayManager {
     }
 
     /**
-     * Gera dinamicamente um ícone vetorial de 32x32 com o padrão de cores CyberCore (#38bdf8).
+     * Obtém o ícone oficial da marca CyberCore em alta resolução para a bandeja do sistema,
+     * com fallback vetorial dinâmico caso o recurso não esteja disponível.
      */
     private Image createTrayIconImage() {
+        Image trayAsset = br.com.cybercore.signer.ui.assets.AssetManager.getTrayIconImage();
+        if (trayAsset != null) {
+            return trayAsset;
+        }
+
         int size = 32;
         BufferedImage image = new BufferedImage(size, size, BufferedImage.TYPE_INT_ARGB);
         Graphics2D g = image.createGraphics();

modules/cybercore-ui/src/main/java/br/com/cybercore/signer/ui/view/MainAppView.java

@@ -155,6 +155,7 @@ public final class MainAppView {
         ThemeManager.addListener(theme -> updateThemeToggleButton());
 
         stage.setTitle(CyberCoreUiConstants.APP_NAME);
+        stage.getIcons().addAll(br.com.cybercore.signer.ui.assets.AssetManager.getApplicationIcons());
         stage.setScene(scene);
 
         if (Boolean.getBoolean("cybercore.diag.plain-stage")) {

modules/cybercore-ui/src/test/java/br/com/cybercore/signer/ui/assets/AssetManagerTest.java

@@ -104,4 +104,15 @@ class AssetManagerTest {
             AssetManager.setExternalOverridesEnabled(null);
         }
     }
+
+    @Test
+    @DisplayName("Deve fornecer ícones multi-resolução da aplicação e imagem para a bandeja nativa")
+    void shouldProvideMultiResolutionIconsAndTrayImage() {
+        java.util.List<javafx.scene.image.Image> icons = AssetManager.getApplicationIcons();
+        assertThat(icons).isNotEmpty();
+        assertThat(icons.size()).isGreaterThanOrEqualTo(5);
+
+        java.awt.Image trayImage = AssetManager.getTrayIconImage();
+        assertThat(trayImage).isNotNull();
+    }
 }