⚙️ Setup required — add your Supabase credentials 1. Open this file and find the two lines marked REPLACE ME near the bottom of the script.
2. Replace SUPABASE_URL → your project URL (e.g. https://abcdefgh.supabase.co)
3. Replace SUPABASE_ANON_KEY → your anon/public key (Settings → API)
4. In Supabase → SQL Editor, run:
CREATE TABLE todo_state (key TEXT PRIMARY KEY, checked BOOLEAN NOT NULL DEFAULT false);
5. Table Editor → todo_state → Authentication → disable RLS (or add anon policy for select/insert/update).
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