Improve dark mode support for Apple dialog styling

Added explicit handling for dark mode in ModelDetailController by assigning a 'dark' style class when appropriate. Updated CSS to support both .root.dark and direct .dark class for Apple dialog, refined background and border colors, and enhanced shadow effects for better visual separation in dark mode. Also removed unused Cupertino theme imports from MainController.

Author: fredericksalazar

src/main/java/com/org/ollamafx/controller/MainController.java

@@ -14,8 +14,6 @@
 import java.io.IOException;
 import java.net.URL;
 import java.util.ResourceBundle;
-import atlantafx.base.theme.CupertinoDark;
-import atlantafx.base.theme.CupertinoLight;
 import javafx.application.Application;
 import javafx.animation.FadeTransition;
 import javafx.animation.Timeline;

src/main/java/com/org/ollamafx/controller/ModelDetailController.java

@@ -70,6 +70,10 @@ private void showDownloadPopup(OllamaModel model) {
             String userAgentStylesheet = Application.getUserAgentStylesheet();
             if (userAgentStylesheet != null && userAgentStylesheet.toLowerCase().contains("light")) {
                 root.getStyleClass().add("light");
+            } else {
+                // If not explicitly light, assume dark (or check for dark)
+                // This ensures .root.dark selectors work inside the popup
+                root.getStyleClass().add("dark");
             }
 
             Stage stage = new Stage();

src/main/resources/css/ollama_active.css

@@ -801,7 +801,8 @@
 
     /* --- APPLE DIALOG REDESIGN --- */
     .apple-dialog {
-        -fx-background-color: -color-bg-default;
+        -fx-background-color: #ffffff;
+        /* Explicit White for Light Mode to float above grey */
         -fx-background-radius: 20px;
         -fx-border-radius: 20px;
         -fx-border-color: rgba(0, 0, 0, 0.1);
@@ -813,9 +814,15 @@
         -fx-alignment: CENTER;
     }
 
-    .root.dark .apple-dialog {
-        -fx-border-color: rgba(255, 255, 255, 0.1);
-        -fx-effect: dropshadow(gaussian, rgba(0, 0, 0, 0.5), 50, 0, 0, 15);
+    /* Support both .root.dark nesting and direct .dark class on the dialog root */
+    .root.dark .apple-dialog,
+    .apple-dialog.dark {
+        -fx-background-color: #2c2c2e;
+        /* Secondary System Fill (Lighter than background) */
+        -fx-border-color: rgba(255, 255, 255, 0.15);
+        /* More visible border */
+        -fx-effect: dropshadow(gaussian, rgba(0, 0, 0, 0.8), 60, 0, 0, 20);
+        /* Stronger shadow for separation */
     }
 
     .apple-dialog-title {