chore: add changeset for org-level custom css and other customization options (#7772)

Author: charIeszhao

.changeset/smooth-experts-dream.md

@@ -0,0 +1,18 @@
+---
+"@logto/console": minor
+"@logto/core": minor
+"@logto/integration-tests": minor
+"@logto/phrases": minor
+"@logto/schemas": minor
+---
+
+unify branding customization options between applications and organizations
+
+We are now offering a more unified experience for branding customization options between applications and organizations, including:
+- Branding colors (light and dark mode)
+- Branding logos and favicons (both light and dark mode)
+- Custom CSS
+
+When all branding customization options are set, the precedence of the options are as follows:
+Organization > Application > Omni sign-in experience settings
+