## Fixes:
1. ✅ Suggested rates now inside Tax Rates card as help notice
- Shows as blue notice box
- Only shows rates not yet added
- Auto-hides when all suggested rates added
2. ✅ Add Rate button now works
- Fixed mutation to properly invalidate queries
- Shows success toast
- Updates list immediately
3. ✅ Add Tax Rate dialog no longer blank
- Replaced shadcn Select with native select
- Form now submits properly
- All fields visible
4. ✅ Tax toggle now functioning
- Changed onChange to onCheckedChange
- Added required id prop
- Properly typed checked parameter
## Additional:
- Added api.put() method to api.ts
- Improved UX with suggested rates as contextual help
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