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/sso/sso-component.service.ts

@@ -0,0 +1,20 @@
+import { ClientType } from "@bitwarden/common/enums";
+
+export type SsoClientType = ClientType.Web | ClientType.Browser | ClientType.Desktop;
+
+/**
+ * Abstract class for SSO component services.
+ */
+export abstract class SsoComponentService {
+  /**
+   * Sets the cookies for the SSO component service.
+   * Used to pass translation messages to the SSO connector page (apps/web/src/connectors/sso.ts) during the SSO handoff process.
+   * See implementation in WebSsoComponentService for example usage.
+   */
+  setDocumentCookies?(): void;
+
+  /**
+   * Closes the window.
+   */
+  closeWindow?(): Promise<void>;
+}