### What?
This PR applies `mergeFieldStyles` to the `ArrayFieldComponent`
component, ensuring that custom admin styles such as `width` are
correctly respected when Array fields are placed inside row layouts.
### Why?
Previously, Array fields did not inherit or apply their `admin.width`
(or other merged field styles). For example, when placing two array
fields side by side inside a row with `width: '50%'`, the widths were
ignored, causing layout issues.
### How?
- Imported and used `mergeFieldStyles` within `ArrayFieldComponent`.
- Applied the merged styles to the root `<div>` via the `style` prop,
consistent with how other field components (like `TextField`) handle
styles.
Fixes#13973
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