[PM-15847] libs/components strict migration (#15738)

This PR migrates `libs/components` to use strict TypeScript.

- Remove `@ts-strict-ignore` from each file in `libs/components` and resolved any new compilation errors
- Converted ViewChild and ContentChild decorators to use the new signal-based queries using the [Angular signal queries migration](https://angular.dev/reference/migrations/signal-queries)
  - Made view/content children `required` where appropriate, eliminating the need for additional null checking. This helped simplify the strict migration.

---

Co-authored-by: Vicki League <vleague@bitwarden.com>

libs/components/src/navigation/side-nav.component.ts

@@ -1,8 +1,6 @@
-// FIXME: Update this file to be type safe and remove this and next line
-// @ts-strict-ignore
 import { CdkTrapFocus } from "@angular/cdk/a11y";
 import { CommonModule } from "@angular/common";
-import { Component, ElementRef, ViewChild, input } from "@angular/core";
+import { Component, ElementRef, input, viewChild } from "@angular/core";
 
 import { I18nPipe } from "@bitwarden/ui-common";
 
@@ -21,15 +19,14 @@ export type SideNavVariant = "primary" | "secondary";
 export class SideNavComponent {
   readonly variant = input<SideNavVariant>("primary");
 
-  @ViewChild("toggleButton", { read: ElementRef, static: true })
-  private toggleButton: ElementRef<HTMLButtonElement>;
+  private readonly toggleButton = viewChild("toggleButton", { read: ElementRef });
 
   constructor(protected sideNavService: SideNavService) {}
 
   protected handleKeyDown = (event: KeyboardEvent) => {
     if (event.key === "Escape") {
       this.sideNavService.setClose();
-      this.toggleButton?.nativeElement.focus();
+      this.toggleButton()?.nativeElement.focus();
       return false;
     }