feat(sso): [PM-8114] implement SSO component UI refresh

Consolidates existing SSO components into a single unified component in
libs/auth, matching the new design system. This implementation:

- Creates a new shared SsoComponent with extracted business logic
- Adds feature flag support for unauth-ui-refresh
- Updates page styling including new icons and typography
- Preserves web client claimed domain logic
- Maintains backwards compatibility with legacy views

PM-8114

---------

Co-authored-by: Jared Snider <116684653+JaredSnider-Bitwarden@users.noreply.github.com>
Co-authored-by: Jared Snider <jsnider@bitwarden.com>

libs/auth/src/angular/anon-layout/anon-layout.component.html

@@ -13,7 +13,10 @@
     <bit-icon [icon]="logo"></bit-icon>
   </a>
 
-  <div class="tw-text-center tw-mb-6">
+  <div
+    class="tw-text-center tw-mb-6"
+    [ngClass]="{ 'tw-max-w-md tw-mx-auto': titleAreaMaxWidth === 'md' }"
+  >
     <div class="tw-mx-auto tw-max-w-28 sm:tw-max-w-32">
       <bit-icon [icon]="icon"></bit-icon>
     </div>