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>

apps/desktop/src/auth/sso-v1.component.html

@@ -0,0 +1,9 @@
+<form id="sso-page" (ngSubmit)="submit()">
+  <div class="content">
+    <img class="logo-image" alt="Bitwarden" />
+    <div class="box">
+      <i class="bwi bwi-spinner bwi-spin" title="{{ 'loading' | i18n }}" aria-hidden="true"></i>
+      {{ "loading" | i18n }}
+    </div>
+  </div>
+</form>