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jekkos 4d6ebbafdd fix: tax rate inputs blank with comma-decimal locales (#4555 )

* fix: tax rate inputs blank with comma-decimal locales

The to_tax_decimals() function returns locale-formatted values
(e.g. "18,00" for comma-decimal locales like fr_FR, de_DE).
Browsers reject comma-decimal values in <input type="number">
and render the field blank.

Use raw float value instead - PHP serializes floats with period
decimal regardless of locale. The parse_tax() on the save side
already handles locale-aware parsing, so round-tripping works
correctly.

Fixes #4553
Regression from commit 42ba39d29

* fix: tax rate input locale handling - save path

The display fix (using (float) instead of to_tax_decimals()) was
correct but incomplete. The save path in Config.php also needed
fixing because parse_tax() misinterprets dot-decimal values from
type="number" inputs when locale uses comma as decimal separator.

Root cause: Browsers submit type="number" inputs as dot-decimal
(e.g., "5.5") regardless of locale. With comma-decimal locales
like de_DE, parse_tax() treats the dot as thousands separator,
causing 5.5 to be saved as 5.

Fix: Replace parse_tax() with direct (float) cast for these
inputs since type="number" already guarantees dot-decimal format.

Includes tests for tax rate handling with various decimal values.

Fixes #4553

* revert: remove type=number from tax rate inputs

Resolution from PR #4555 review: Revert to text inputs for locale-specific
tax rate fields.

The type='number' attribute was added in commit 42ba39d29, but it caused
issues with locale-specific decimal separators. Browsers submit type='number'
inputs as dot-decimal regardless of locale, which breaks comma-decimal locales.

Solution: Revert to text inputs which use to_tax_decimals() for display
and parse_tax() for saving, correctly handling locale-specific formatting.

Changes:
- tax_config.php: Remove type='number', step, min, max attributes
- tax_config.php: Restore to_tax_decimals() for value display
- Config.php: Restore parse_tax() for tax rate parsing
- ConfigTest.php: Remove tests added for the type='number' approach

Fixes #4553

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Co-authored-by: Ollama <ollama@steganos.dev>