Fix Price object cast error when editing tier and customer group prices

[krlmrr]

Summary

Fixes a regression in 1.5.0-beta.2 / beta.3 where opening the edit modal for a tier price or customer group price throws:

ErrorException: Object of class Lunar\DataTypes\Price could not be converted to float
at vendor/filament/schemas/src/Components/StateCasts/NumberStateCast.php:28

This is the same ordering bug as #2441 — Filament v4's NumberStateCast (registered by ->numeric()) runs floatval() on the raw state during hydration, before formatStateUsing is given a chance to unwrap the value. The two relation managers that bind a Lunar\DataTypes\Price object straight to a numeric TextInput were not covered by that fix.

PR #2441 solved the equivalent problem for FieldType attribute values by overriding hydrateState. For prices, the values arrive through plain record attributes, so EditAction::mutateRecordDataUsing() runs early enough to convert the Price object into its decimal value before child component hydration — which means the formatStateUsing calls can be removed entirely.

Changes

• PriceRelationManager and CustomerGroupPricingRelationManager: add mutateRecordDataUsing on the EditAction to convert Price objects to their decimal value via a small unwrapPriceData helper.
• Drop the now-redundant formatStateUsing callbacks on price / compare_price text inputs.
• Add Pest feature tests that mount the edit action against a stored price and verify the form receives the expected decimal values (these tests fail on 1.x without the fix with the original exception).

Test plan

• vendor/bin/pest --testsuite=admin --group=resource.product
• vendor/bin/pest --testsuite=admin --filter='customer group price|tier price'
• vendor/bin/pint --format agent on touched files
• Confirmed the new tests fail on 1.x without the fix (reproducing the original Object of class Lunar\DataTypes\Price could not be converted to float exception)