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* fix(taxes): reject negative tax rates and percentages
Reject negative tax values across all tax entry points so they can
never be persisted and produce inverted sales totals:
- Items::postSave / postBulkUpdate: validate tax_percents.* as
nonNegativeDecimal (was unvalidated, persisted raw).
- Items::save_tax_data (CSV import): fail the row on a negative
Tax N Percent instead of silently dropping the tax.
- Taxes::postSave: reject negative tax_rate before saving.
- Config::postSaveTax: reject negative default tax rates.
Adds non-negative regression tests for Items, Taxes and Config, plus
boundary tests proving a zero tax rate/percent is still accepted. New
language strings for the rejection messages.
* test: adopt test{Method}_{Purpose} naming convention for new tests
Align the negative-tax test method names with the convention established
in ConfigTest (testPostSave_RejectsNegativeTaxPercent, etc.), per review.
* fix(config): add language entries to all locales, extract TaxFixtureTrait
* fix(i18n): place tax_rate_non_negative in alphabetical order
Move the new tax_rate_non_negative entry to its correct alphabetical
position (after tax_rate_error_adding_updating) in all locale files.
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Co-authored-by: objecttothis <17935339+objecttothis@users.noreply.github.com>