chore: bump version to 2.21.19 in package.json and enhance invitation validation (#434)

- Updated application version from 2.21.18 to 2.21.19 in package.json.
- Improved invitation validation by handling cases where the invitation is not found and ensuring email comparison is case insensitive.

pnpm-workspace.yaml

@@ -4,21 +4,21 @@ packages:
   - tooling/*
 
 catalog:
-  '@next/bundle-analyzer': 16.1.0
-  '@next/eslint-plugin-next': 16.1.0
+  '@next/bundle-analyzer': 16.1.1
+  '@next/eslint-plugin-next': 16.1.1
   '@supabase/supabase-js': 2.89.0
   '@tailwindcss/postcss': 4.1.18
   '@tanstack/react-query': 5.90.12
   '@types/node': 25.0.3
   '@types/react': 19.2.7
   '@types/react-dom': 19.2.3
-  eslint-config-next: 16.1.0
-  next: 16.1.0
+  eslint-config-next: 16.1.1
+  next: 16.1.1
   react: 19.2.3
   react-dom: 19.2.3
-  react-i18next: 16.5.0
   react-hook-form: 7.69.0
-  supabase: 2.67.3
+  react-i18next: 16.5.0
+  supabase: 2.70.3
   tailwindcss: 4.1.18
   tw-animate-css: 1.4.0
   zod: 3.25.76