Use plugin-specific i18n domain for translations (#98)

Convert __() calls in src/ and templates/ to __d('geo', ...) so user-facing
strings live in their own translation domain instead of leaking into the host
app's default domain. Also re-route the pre-existing __d('tools', ...) calls
in the pagination element and GoogleMapHelper alt-text — they were leftovers
from when this code was copied from cakephp-tools — to __d('geo', ...) so the
plugin owns its strings.

Add resources/locales/geo.pot generated via cake i18n extract so translators
have a stable POT to base language files on.

Add more tests for improved coverage

- GeoCoordinate: comprehensive tests for all methods
- Calculator: exception paths, GeoCoordinate support, blur with level 0
- GeoCalculator: empty array exception path
- GeoapifyProvider: named colors, hex colors, invalid size, marker options

Fix __PHP_Incomplete_Class error when reading cached geocode data (#77)

* Fix __PHP_Incomplete_Class error when reading cached geocode data

When cached geocode data cannot be properly unserialized (e.g., due to
missing class definitions during autoloading), PHP returns an
__PHP_Incomplete_Class object instead of the expected Geocoder\Location.

This caused a TypeError when isExpectedType() was called on the invalid
object.

The fix validates that cached data is a proper Location instance before
returning it. If the data is invalid, it deletes the corrupted cache
entry and re-geocodes the address.

* Store geocode cache as JSON instead of serialized PHP objects

This change replaces PHP object serialization with JSON for the cached
geocode data, which prevents __PHP_Incomplete_Class issues entirely.

Changes:
- Add CachedLocation class that implements Geocoder\Location interface
  and can be reconstructed from JSON array data
- Change 'data' column type from 'object' to 'json'
- Store $result->toArray() instead of the full Location object
- When reading from cache, reconstruct CachedLocation from JSON array
- Maintains backwards compatibility: old serialized Location objects
  are still handled (returned directly if valid, deleted if corrupted)

Benefits:
- No PHP serialization means no class autoloading issues
- JSON is human-readable and debuggable
- Cache data survives PHP/library version upgrades
- Self-healing: invalid cache entries are automatically cleaned up

* Fix coding style and PHPStan errors

- Apply PSR-2R coding standard (braces on same line)
- Remove unused Location import
- Simplify cache reading logic (no backwards compat for old serialized objects since JSON type won't decode them anyway)

Fix security vulnerabilities and add type hints

- Fix unsafe deserialization in ObjectType by whitelisting safe classes
- Fix path traversal vulnerability in GoogleMapHelper icon method
- Fix SQL injection in GeocoderBehavior distanceConditions
- Implement isAccurateEnough() method in Geocoder
- Add missing type hints to GoogleMapHelper methods
- Fix type casting in GeoCoordinate::fromString()

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Remove deprecations

Adjust migration files.

PHPStan

Fix deprecations

Fix up phpcs version

Update Geocoder.md