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/+layout.svelte

@@ -13,6 +13,7 @@
   import merge from 'lodash/merge';
   import { MetaTags } from 'svelte-meta-tags';
   import { ModeWatcher } from '@cio/ui/base/dark-mode';
+  import OrgSiteFavicon from '$features/app/org-site-favicon.svelte';
 
   import '../app.css';
 
@@ -62,6 +63,17 @@
   });
 </script>
 
+{#if data.isOrgSite}
+  <OrgSiteFavicon org={data.org} />
+{/if}
+
+<svelte:head>
+  {#if !data.isOrgSite}
+    <link rel="icon" type="image/png" href="/favicon.ico" />
+    <link rel="icon" type="image/png" sizes="32x32" href="/logo-32.png" />
+  {/if}
+</svelte:head>
+
 <div>
   <ModeWatcher />