Fix Supabase Storage API calls

Corrected endpoint paths and authorization headers for Supabase Storage API calls.

src/contexts/auth/signInUtils.ts

@@ -13,7 +13,6 @@ export const signInWithDirectApi = async (email: string, password: string) => {
     const tokenUrl = `${supabase.auth.url}/token?grant_type=password`;
     const headers = {
       'Content-Type': 'application/json',
-      'apikey': supabase.supabaseKey,
       'Authorization': `Bearer ${supabase.supabaseKey}`,
       'X-Client-Info': 'supabase-js/2.x'
     };