Fix: Build errors

[gregnr]

Problem

npm run build failed because of a few reasons:

• supabase/functions were included in the frontend TS compilation
• The way cookies were loaded caused a DynamicServerError (see this issue)

Solution

• Exclude supabase/functions from TS build (except supabase/functions/_lib/database.ts which we use on the frontend for DB types)
• Change the way cookies are loaded so that they are available in the JS execution context during the Next.js build