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/lib/utils/functions/org-branding.ts

@@ -1,15 +1,20 @@
 import type { AccountOrg } from '$features/app/types';
 
-export function getOrgFaviconHref(org: Pick<AccountOrg, 'favicon' | 'avatarUrl'> | null | undefined): string | null {
+export function getOrgFaviconHref(
+  org: Pick<AccountOrg, 'favicon' | 'avatarUrl'> | null | undefined,
+  pageOrigin?: string
+): string | null {
   const favicon = org?.favicon?.trim();
-  if (favicon) {
-    return favicon;
-  }
-
   const avatarUrl = org?.avatarUrl?.trim();
-  if (avatarUrl) {
-    return avatarUrl;
+  const rawHref = favicon || avatarUrl;
+
+  if (!rawHref) {
+    return null;
   }
 
-  return null;
+  try {
+    return new URL(rawHref, pageOrigin || undefined).href;
+  } catch {
+    return rawHref;
+  }
 }