## What
Adds Saudi Riyal (SAR) as a supported currency for both user primary
currency and account currency.
## Why
SAR is fully supported by the `@fawazahmed0/currency-api` conversion
backend (verified rates are returned), so it works end-to-end with the
existing conversion system.
## Changes
- `config/currencies.php`: add SAR with `allows_primary: true`,
`allows_account: true`
- Tests mirroring the BRL cases in `AccountTest` and `ProfileUpdateTest`
## Testing
- `php artisan test` on both settings test files — 32 passed
- `vendor/bin/pint --dirty` — clean
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