Replace loose equality (== null, != null) with strict equality

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/views/Files/Files.vue

@@ -357,7 +357,7 @@
       },
       allFiles: {
         handler(newValue) {
-          if(newValue != null) this.compareData = JSON.parse(JSON.stringify(newValue));
+          if(newValue !== null) this.compareData = JSON.parse(JSON.stringify(newValue));
         }
       },
       reallyDeleteData: {