fix(org): show org logo for favicon and OG image (#713)

When no custom favicon is set, fall back to the organization logo on
public org-site pages instead of the default ClassroomIO icon.

For OG images, only apply the theme-color background behind the logo
when rendering initials; real logo images now render without the tint.

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>

apps/dashboard/src/routes/(org-site)/+layout.svelte

@@ -1,6 +1,5 @@
 <script lang="ts">
   import { PageRestricted } from '$features/ui';
-  import OrgSiteFavicon from '$features/app/org-site-favicon.svelte';
   import { currentOrg } from '$lib/utils/store/org';
   import { onMount } from 'svelte';
   import { afterNavigate } from '$app/navigation';
@@ -41,8 +40,6 @@
   });
 </script>
 
-<OrgSiteFavicon org={data.org} />
-
 {#if data.org?.isRestricted || $currentOrg.isRestricted}
   <PageRestricted />
 {:else}