refactor: remove disabled binding from portfolio filter form and streamline tag control logic

libs/ui/src/lib/assistant/assistant.html

@@ -185,7 +185,6 @@
         #portfolioFilterForm
         [accounts]="user?.accounts"
         [assetClasses]="assetClasses"
-        [disabled]="!hasPermissionToChangeFilters"
         [formControl]="portfolioFilterFormControl"
         [holdings]="holdings"
         [tags]="tags"

libs/ui/src/lib/portfolio-filter-form/portfolio-filter-form.component.ts

@@ -124,8 +124,11 @@ export class GfPortfolioFilterFormComponent
       this.filterForm.enable({ emitEvent: false });
     }
 
+    const tagControl = this.filterForm.get('tag');
     if (this.tags.length === 0) {
-      this.filterForm.get('tag')?.disable({ emitEvent: false });
+      tagControl?.disable({ emitEvent: false });
+    } else if (!this.disabled) {
+      tagControl?.enable({ emitEvent: false });
     }
 
     this.changeDetectorRef.markForCheck();