Remove standalone true from platform and UIF (#15032)

Remove standalone: true from every instance since it's the default as of Angular 19.

libs/components/src/a11y/a11y-cell.directive.ts

@@ -6,7 +6,6 @@ import { FocusableElement } from "../shared/focusable-element";
 
 @Directive({
   selector: "bitA11yCell",
-  standalone: true,
   providers: [{ provide: FocusableElement, useExisting: A11yCellDirective }],
 })
 export class A11yCellDirective implements FocusableElement {

libs/components/src/a11y/a11y-grid.directive.ts

@@ -15,7 +15,6 @@ import { A11yRowDirective } from "./a11y-row.directive";
 
 @Directive({
   selector: "bitA11yGrid",
-  standalone: true,
 })
 export class A11yGridDirective implements AfterViewInit {
   @HostBinding("attr.role")

libs/components/src/a11y/a11y-row.directive.ts

@@ -13,7 +13,6 @@ import { A11yCellDirective } from "./a11y-cell.directive";
 
 @Directive({
   selector: "bitA11yRow",
-  standalone: true,
 })
 export class A11yRowDirective implements AfterViewInit {
   @HostBinding("attr.role")

libs/components/src/a11y/a11y-title.directive.ts

@@ -4,7 +4,6 @@ import { Directive, ElementRef, Input, OnInit, Renderer2 } from "@angular/core";
 
 @Directive({
   selector: "[appA11yTitle]",
-  standalone: true,
 })
 export class A11yTitleDirective implements OnInit {
   @Input() set appA11yTitle(title: string) {