One-time setup (5 min):
1.
script.google.com → New project → paste Code.gs → Save
2. Run
setupAllSheets once (grant permissions)
3. Deploy → New deployment → Web app → Anyone → Deploy → copy URL
4. Create a Google Sheet → copy its ID from the URL
5. Paste both above and click Save & test
3 sheets created: Expenses · Income · Tasks
Each has a Thread column — no per-thread tabs, stays light forever.