pluck() should infer value type from @property annotations

[alies-dev]

Summary

Collection::pluck() on a typed Eloquent model always returns Collection<int, mixed>, even when the plucked column has a known type from @property annotations.

Example

/**
 * @property string $notification_class
 */
class User extends Model {}

// Current: Collection<int, mixed>
// Expected: Collection<int, string>
$emails = User::query()
    ->select('email')
    ->distinct()
    ->get()
    ->pluck('email');

Problem

Because pluck() returns mixed values, downstream operations like combine() trigger InvalidTemplateParam errors since combine() expects array-key keys:

// ERROR: InvalidTemplateParam - TKey expects array-key, mixed given
$emails->combine($emails)->all();

Users must work around this with explicit @var annotations:

/** @var \Illuminate\Support\Collection<int, string> $emails */
$emails = User::query()->...->pluck('email');

Expected behavior

When pluck('column_name') is called on an Eloquent\Collection (or query builder result) where the model has @property Type $column_name, the plugin should infer the return type as Collection<int, Type> instead of Collection<int, mixed>.

This would eliminate a class of false-positive InvalidTemplateParam errors and reduce the need for manual type annotations.