UI updates

src/main/java/cz/kamma/kfmanager/config/AppConfig.java

@@ -101,6 +101,18 @@ public class AppConfig {
     public void setActivePanel(String panel) {
         properties.setProperty("active.panel", panel);
     }
+
+    public int getBriefMouseWheelSteps() {
+        try {
+            return Integer.parseInt(properties.getProperty("brief.mousewheel.steps", "10"));
+        } catch (NumberFormatException e) {
+            return 10;
+        }
+    }
+
+    public void setBriefMouseWheelSteps(int steps) {
+        properties.setProperty("brief.mousewheel.steps", String.valueOf(steps));
+    }
     
     public String getLeftPanelPath() {
         return properties.getProperty("leftPanel.path", System.getProperty("user.home"));

src/main/java/cz/kamma/kfmanager/ui/FilePanelTab.java

@@ -535,7 +535,26 @@ public class FilePanelTab extends JPanel {
     JScrollPane scrollPane = new JScrollPane(fileTable);
     // Enable horizontal scrollbar when needed so BRIEF mode can scroll left-right
     scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
-        add(scrollPane, BorderLayout.CENTER);
+
+    // Implement mouse wheel navigation in BRIEF mode to match arrow key behavior
+    fileTable.addMouseWheelListener(new java.awt.event.MouseWheelListener() {
+        @Override
+        public void mouseWheelMoved(java.awt.event.MouseWheelEvent e) {
+            if (viewMode == ViewMode.BRIEF) {
+                int rotation = e.getWheelRotation();
+                if (rotation != 0) {
+                    int steps = 10;
+                    if (persistedConfig != null) {
+                        steps = persistedConfig.getBriefMouseWheelSteps();
+                    }
+                    handleBriefNavigation(rotation > 0, steps);
+                    e.consume();
+                }
+            }
+        }
+    });
+
+    add(scrollPane, BorderLayout.CENTER);
         
     // Status bar
         statusLabel = new JLabel(" ");
@@ -683,15 +702,18 @@ public class FilePanelTab extends JPanel {
     }
     
     private void handleBriefNavigation(boolean down) {
+        handleBriefNavigation(down, 1);
+    }
+
+    private void handleBriefNavigation(boolean down, int amount) {
         int currentRow = fileTable.getSelectedRow();
         if (currentRow < 0) return;
         
         int currentIndex = briefCurrentColumn * tableModel.briefRowsPerColumn + currentRow;
-        int newIndex = down ? currentIndex + 1 : currentIndex - 1;
+        int newIndex = down ? currentIndex + amount : currentIndex - amount;
         
-        if (newIndex < 0 || newIndex >= tableModel.items.size()) {
+        if (newIndex < 0) newIndex = 0;
-            return;
+        if (newIndex >= tableModel.items.size()) newIndex = tableModel.items.size() - 1;
-        }
         
         int newColumn = newIndex / tableModel.briefRowsPerColumn;
         int newRow = newIndex % tableModel.briefRowsPerColumn;

src/main/java/cz/kamma/kfmanager/ui/MainWindow.java

@@ -95,7 +95,6 @@ public class MainWindow extends JFrame {
         String leftPath = config.getLeftPanelPath();
         leftPanel = new FilePanel(leftPath);
     leftPanel.setAppConfig(config);
-    leftPanel.setBorder(BorderFactory.createTitledBorder("Left panel"));
     // Provide a callback so tabs inside the panel can request switching panels with TAB
     leftPanel.setSwitchPanelCallback(() -> switchPanelsFromChild());
     leftPanel.setOnDirectoryChangedAll(() -> updateCommandLinePrompt());
@@ -112,7 +111,6 @@ public class MainWindow extends JFrame {
         String rightPath = config.getRightPanelPath();
         rightPanel = new FilePanel(rightPath);
     rightPanel.setAppConfig(config);
-    rightPanel.setBorder(BorderFactory.createTitledBorder("Right panel"));
     // Provide a callback so tabs inside the panel can request switching panels with TAB
     rightPanel.setSwitchPanelCallback(() -> switchPanelsFromChild());
     rightPanel.setOnDirectoryChangedAll(() -> updateCommandLinePrompt());
@@ -724,6 +722,8 @@ public class MainWindow extends JFrame {
         if (sel != null) {
             if (leftPanel != null) leftPanel.applySelectionColor(sel);
             if (rightPanel != null) rightPanel.applySelectionColor(sel);
+            // Ensure the active panel border uses the updated configuration color immediately
+            SwingUtilities.invokeLater(() -> updateActivePanelBorder());
         }
 
         Color mark = config.getMarkedColor();
@@ -957,10 +957,14 @@ public class MainWindow extends JFrame {
      * Update panel borders according to active panel
      */
     private void updateActivePanelBorder() {
-    leftPanel.setBorder(BorderFactory.createTitledBorder(
+        Color selColor = config.getSelectionColor();
-        activePanel == leftPanel ? "Left panel [ACTIVE]" : "Left panel"));
+        if (selColor == null) selColor = new Color(184, 207, 229);
-    rightPanel.setBorder(BorderFactory.createTitledBorder(
+        
-        activePanel == rightPanel ? "Right panel [ACTIVE]" : "Right panel"));
+        // Active panel uses selection color, inactive panel uses a very dark gray border
+        Color inactiveColor = new Color(45, 45, 45);
+        
+        leftPanel.setBorder(BorderFactory.createLineBorder(activePanel == leftPanel ? selColor : inactiveColor, 2));
+        rightPanel.setBorder(BorderFactory.createLineBorder(activePanel == rightPanel ? selColor : inactiveColor, 2));
     }
     
     /**

src/main/java/cz/kamma/kfmanager/ui/SettingsDialog.java

@@ -25,6 +25,7 @@ public class SettingsDialog extends JDialog {
     private final Color originalSel;
     private final Color originalMark;
     private final Color originalFolder;
+    private final int originalBriefMouseWheelSteps;
     private final Font originalGlobalFont;
     private final Font originalEditorFont;
     private final String originalExternalEditorPath;
@@ -55,6 +56,7 @@ public class SettingsDialog extends JDialog {
         this.originalSel = config.getSelectionColor();
         this.originalMark = config.getMarkedColor();
         this.originalFolder = config.getFolderColor();
+        this.originalBriefMouseWheelSteps = config.getBriefMouseWheelSteps();
         this.originalGlobalFont = config.getGlobalFont();
         this.originalEditorFont = config.getEditorFont();
         this.originalExternalEditorPath = config.getExternalEditorPath();
@@ -70,6 +72,7 @@ public class SettingsDialog extends JDialog {
     DefaultListModel<String> model = new DefaultListModel<>();
     model.addElement("Appearance");
     model.addElement("Editor");
+    model.addElement("Behavior");
     model.addElement("Sorting");
     model.addElement("Toolbar");
     model.addElement("Associations");
@@ -83,6 +86,7 @@ public class SettingsDialog extends JDialog {
         // Build category panels
     cards.add(buildAppearancePanel(), "Appearance");
     cards.add(buildEditorPanel(), "Editor");
+    cards.add(buildBehaviorPanel(), "Behavior");
     cards.add(buildSortingPanel(), "Sorting");
     cards.add(buildToolbarPanel(), "Toolbar");
     cards.add(buildAssociationsPanel(), "Associations");
@@ -199,6 +203,15 @@ public class SettingsDialog extends JDialog {
                 config.setExternalEditorPath(externalEditorField.getText());
             }
 
+            // Collect Behavior settings
+            JPanel behaviorHolder = (JPanel) panels.get("Behavior");
+            if (behaviorHolder != null) {
+                try {
+                    JSpinner mws = (JSpinner) behaviorHolder.getClientProperty("mouseWheelSteps");
+                    if (mws != null) config.setBriefMouseWheelSteps((Integer) mws.getValue());
+                } catch (Exception ignore) {}
+            }
+
             // Persist config and notify caller
             config.saveConfig();
             if (onChange != null) onChange.run();
@@ -211,6 +224,7 @@ public class SettingsDialog extends JDialog {
             config.setSelectionColor(originalSel);
             config.setMarkedColor(originalMark);
             config.setFolderColor(originalFolder);
+            config.setBriefMouseWheelSteps(originalBriefMouseWheelSteps);
             config.setGlobalFont(originalGlobalFont);
             config.setEditorFont(originalEditorFont);
             config.setExternalEditorPath(originalExternalEditorPath);
@@ -402,6 +416,32 @@ public class SettingsDialog extends JDialog {
         return p;
     }
 
+    private JPanel buildBehaviorPanel() {
+        JPanel p = new JPanel(new BorderLayout(8, 8));
+        JPanel grid = new JPanel(new GridBagLayout());
+        grid.setBorder(BorderFactory.createEmptyBorder(12, 12, 12, 12));
+
+        GridBagConstraints gbc = new GridBagConstraints();
+        gbc.fill = GridBagConstraints.HORIZONTAL;
+        gbc.insets = new Insets(4, 4, 4, 4);
+        gbc.weightx = 1.0;
+
+        int row = 0;
+
+        // Mouse wheel steps in brief mode
+        gbc.gridx = 0; gbc.gridy = row; gbc.weightx = 0.0;
+        grid.add(new JLabel("Mouse wheel steps (Brief mode):"), gbc);
+
+        JSpinner mwSteps = new JSpinner(new SpinnerNumberModel(config.getBriefMouseWheelSteps(), 1, 100, 1));
+        gbc.gridx = 1; gbc.gridy = row++; gbc.weightx = 1.0;
+        grid.add(mwSteps, gbc);
+
+        p.add(grid, BorderLayout.NORTH);
+        p.putClientProperty("mouseWheelSteps", mwSteps);
+        panels.put("Behavior", p);
+        return p;
+    }
+
     private JPanel buildSortingPanel() {
         JPanel p = new JPanel(new BorderLayout(8, 8));
         JPanel grid = new JPanel();