Add OrgAvatar component and frontend-utils package

- Create @reviq/frontend-utils package for frontend-specific utilities
- Add OrgAvatar component with size variants (xs, sm, md, lg, xl)
- Display org initials with deterministic colors when no logo available
- Add getOrgInitials and getOrgColor utility functions
- Update org-switcher and all org display pages to use OrgAvatar
- Add noNonNullAssertion lint rule as error in biome.jsonc

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/frontend-utils/tsconfig.json

@@ -0,0 +1,6 @@
+{
+  "extends": "@macalinao/tsconfig/tsconfig.base.json",
+  "compilerOptions": {
+    "types": ["bun"]
+  }
+}