Custom page settings (title, slug, meta, published, navigation) now
appear as a collapsible section at the top of the Page tab. The
separate Settings tab has been fully removed.
- Add page_settings_section component to page_renderer.ex
- Remove dead :settings case from editor_panel_content
- Delete settings_editor.ex component entirely
- Remove SettingsEditor import from shop_components.ex
- Add .page-settings-* CSS styles
- Clean up old .settings-* CSS styles
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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