Fix: Wrapping div has height despite no content shown. [ED-24996]

[RobiFerentz]

✨ PR Description

1. Problem & Context

Wrapping Box component was causing unwanted height on the banner container. Moved spacing logic directly to Welcome component via sx prop to eliminate the outer wrapper.

2. What Changed (Where)

• hello-elementor-conversion-banner.js: Removed Box wrapper; consolidated pt/pr/pb spacing into mt/mr/mb on Welcome component with width: 100% applied directly.

3. How It Works

Welcome now manages its own spacing through margin and padding props instead of relying on parent Box for layout. No structural change—purely shifting responsibility for spacing down one level.

4. Risks

None. DOM structure simplified; behavior identical since Welcome applies the same spacing values.

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