feat: Add model preview suffix for better clarity in model names

Author: ethanyhou

com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/ModelPickerGroupsBuilder.java

@@ -120,13 +120,16 @@ private static List<DropdownItem> buildModelDropdownItems(List<CopilotModel> mod
       Function<CopilotModel, String> reasoningEffortResolver) {
     List<DropdownItem> items = new ArrayList<>();
     for (CopilotModel model : models) {
+      String rawName = model.getModelName();
+      boolean alreadyHasPreview = rawName != null && rawName.toLowerCase().endsWith("(preview)");
+      String name = model.isPreview() && !alreadyHasPreview ? rawName + " " + Messages.model_preview_suffix : rawName;
+
       String effectiveEffort = reasoningEffortResolver != null ? reasoningEffortResolver.apply(model) : null;
       String suffix = ModelUtils.getModelSuffix(model, effectiveEffort);
-      String name = model.getModelName();
-      String effortLabel = ModelUtils.formatReasoningEffortLevel(effectiveEffort);
-      String selectedLabel = StringUtils.isNotBlank(effortLabel) && StringUtils.isNotBlank(name)
-          ? name + " - " + effortLabel : null;
-      items.add(new DropdownItem.Builder().id(name).label(name).selectedLabel(selectedLabel).suffix(suffix)
+      String effortLevel = ModelUtils.formatReasoningEffortLevel(effectiveEffort);
+      String selectedLabel = StringUtils.isNotBlank(effortLevel) ? name + " - " + effortLevel : null;
+
+      items.add(new DropdownItem.Builder().id(rawName).label(name).selectedLabel(selectedLabel).suffix(suffix)
           .icon(resolveModelIcon(model)).hoverProvider(new ModelHoverContentProvider(model)).build());
     }
     return items;

com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/i18n/Messages.java

@@ -214,6 +214,7 @@ public final class Messages extends NLS {
   public static String chat_historyView_deleteIcon_tooltip;
   public static String model_billing_multiplier_suffix;
   public static String model_billing_multiplier_variable;
+  public static String model_preview_suffix;
   public static String model_hover_contextSize;
   public static String model_hover_cost;
   public static String model_hover_thinkingEffort;

com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/i18n/messages.properties

@@ -165,6 +165,7 @@ chat_historyView_editIcon_tooltip=Edit conversation title
 chat_historyView_deleteIcon_tooltip=Delete conversation
 model_billing_multiplier_suffix=x
 model_billing_multiplier_variable=Variable
+model_preview_suffix=(Preview)
 chat_addContext_tooltip=Add Context...
 chat_filePicker_title=Search attachments
 chat_filePicker_message=Choose files from the list, or search for files: