merge page settings into Page tab and remove Settings tab

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>

docs/plans/editor-reorganisation.md

@@ -215,8 +215,8 @@ end
 | 16 | Footer: read new fields | 15 | 30m | done |
 | 17 | Move branding settings from Theme to Site | 4 | 1h | done |
 | 18 | Theme tab: remove branding, polish remaining | 17 | 30m | done |
-| 19 | Merge page settings into Page tab | — | 45m | planned |
-| 20 | Remove Settings tab | 19 | 15m | planned |
+| 19 | Merge page settings into Page tab | — | 45m | done |
+| 20 | Remove Settings tab | 19 | 15m | done |
 | 21 | Polish: responsive, empty states, validation | 1-20 | 1.5h | planned |
 | 22 | Testing: all page types, edge cases | 21 | 30m | planned |
 
@@ -328,6 +328,25 @@ Moved branding settings from Theme tab to Site tab.
 - Accent, hover, sale colours
 - Customise accordion with typography, colours, layout, shape, products, product page groups
 
+### Completed: Page Settings Migration (Tasks 19-20)
+
+Merged custom page settings inline into Page tab and removed Settings tab.
+
+**What changed:**
+- Custom pages show a collapsible "Page settings" section at the top of the Page tab
+- Contains: title, URL slug, meta description, published toggle, show in nav toggle, nav label, nav position
+- System pages, product pages, and collection pages no longer show settings (editing done elsewhere)
+- Settings tab button was already removed from UI; dead code removed from page_renderer.ex
+- Deleted `settings_editor.ex` component entirely
+
+**Files modified:**
+- `lib/berrypod_web/page_renderer.ex` - Added `page_settings_section` component inline in `editor_sheet_content`
+- `lib/berrypod_web/components/shop_components.ex` - Removed SettingsEditor import
+- `assets/css/admin/components.css` - Added `.page-settings-*` styles, removed old `.settings-*` styles
+
+**Files deleted:**
+- `lib/berrypod_web/components/shop_components/settings_editor.ex`
+
 ## UI Wireframes
 
 ### Site tab layout