feat(duplicates): exit duplicate mode when no duplicates found, #783

When no duplicate groups are detected, the duplicate manager now checks if it is currently in duplicate mode and calls `exitDuplicateMode()` to clear the display. This prevents the UI from showing stale duplicate information when no duplicates exist.

static/js/components/ModelDuplicatesManager.js

@@ -127,6 +127,10 @@ export class ModelDuplicatesManager {
 
             if (this.duplicateGroups.length === 0) {
                 showToast('toast.duplicates.noDuplicatesFound', { type: this.modelType }, 'info');
+                // If already in duplicate mode, exit to clear the display
+                if (this.inDuplicateMode) {
+                    this.exitDuplicateMode();
+                }
                 return false;
             }