Support trait-named lifecycle hooks on pages and importers

[oddvalue]

Description

Lifecycle hooks (beforeFill, afterCreate, afterSave, etc.) can currently only be defined directly on the page class. A trait that defines one of these hooks is silently overridden the moment the page declares its own, which makes it impossible for reusable traits and plugins to reliably hook into the page lifecycle.

This PR makes callHook() also invoke {hook}{TraitName}() for every trait used by the class (recursively), mirroring how Eloquent boots model traits via boot{TraitName}() and how Livewire supports mount{TraitName}() / boot{TraitName}() trait hooks:

trait HandlesDrafts
{
    protected function afterSaveHandlesDrafts(): void
    {
        // Runs in addition to the page's own afterSave().
    }
}

class EditUser extends EditRecord
{
    use HandlesDrafts;

    protected function afterSave(): void
    {
        // Both hooks are called; this one first.
    }
}

Behaviour

• The class's own hook runs first, then each trait hook (in class_uses_recursive() order).
• Duplicate method names (two traits sharing a basename) are only called once.
• Applies everywhere callHook() is used: panel pages (BasePage — so all CreateRecord / EditRecord / ViewRecord, tenancy and auth pages) and importers (Importer).
• Fully backwards compatible: existing hooks behave exactly as before; the trait convention is purely additive.

Changes

• packages/panels/src/Pages/BasePage.php — callHook() calls trait-named hooks after the class hook.
• packages/actions/src/Imports/Importer.php — same change for importer hooks.
• docs/03-resources/03-creating-records.md, docs/03-resources/04-editing-records.md — new "Defining lifecycle hooks in traits" sections.
• Tests — new fixtures (TracksLifecycleHooks trait, CreatePostWithTraitHooks, EditPostWithTraitHooks) and cases in CreateRecordTest / EditRecordTest asserting the page hook and the trait hooks all fire, in order.

Visual changes

None — no UI changes.

Functional changes

• Code style has been fixed by running the composer cs command. (Rector and Pint run clean on all touched files; Prettier ignores *.md, and no JS/Blade files are touched.)
• Changes have been tested to not break existing functionality. (tests/src/Panels/Resources/Pages/CreateRecordTest.php + EditRecordTest.php: 65 passed, 194 assertions, including the two new cases. tests/src/Actions/ImportActionTest.php + tests/src/Actions/Imports/ImporterTest.php: 35 passed, 54 assertions.)
• Documentation is up-to-date. (Creating- and editing-records lifecycle hook docs extended.)