add Site context with social links editor and site-wide settings

- Add Site context for managing site-wide content (social links, nav items,
  announcement bar, footer content)
- Add SocialLink schema with URL normalization and platform auto-detection
  supporting 40+ platforms via host and 25+ via URI scheme
- Add NavItem schema for header/footer navigation (editor UI coming next)
- Add SiteEditor component with collapsible sections for each content type
- Wire social links card block and footer to use database data
- Filter empty URLs from display in shop components
- Add DetailsPreserver hook to preserve collapsible section state
- Add comprehensive tests for Site context and SocialLink functions
- Remove unused helper functions from onboarding to fix compiler warnings
- Move sync_edit_url_param helper to group handle_editor_event clauses

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

lib/berrypod_web/page_renderer.ex

@@ -86,9 +86,12 @@ defmodule BerrypodWeb.PageRenderer do
       editing={@editing}
       theme_editing={Map.get(assigns, :theme_editing, false)}
       editor_dirty={@editor_dirty}
+      theme_dirty={Map.get(assigns, :theme_dirty, false)}
+      site_dirty={Map.get(assigns, :site_dirty, false)}
       editor_sheet_state={assigns[:editor_sheet_state] || :collapsed}
       editor_save_status={@editor_save_status}
       editor_active_tab={Map.get(assigns, :editor_active_tab, :page)}
+      editor_nav_blocked={Map.get(assigns, :editor_nav_blocked)}
       has_editable_page={@page != nil}
     >
       <.editor_panel_content
@@ -123,6 +126,15 @@ defmodule BerrypodWeb.PageRenderer do
         settings_form={Map.get(assigns, :settings_form)}
         settings_dirty={Map.get(assigns, :settings_dirty, false)}
         settings_save_status={Map.get(assigns, :settings_save_status, :idle)}
+        site_header_nav={Map.get(assigns, :site_header_nav, [])}
+        site_footer_nav={Map.get(assigns, :site_footer_nav, [])}
+        site_social_links={Map.get(assigns, :site_social_links, [])}
+        site_announcement_text={Map.get(assigns, :site_announcement_text, "")}
+        site_announcement_link={Map.get(assigns, :site_announcement_link, "")}
+        site_announcement_style={Map.get(assigns, :site_announcement_style, "info")}
+        site_footer_about={Map.get(assigns, :site_footer_about, "")}
+        site_footer_copyright={Map.get(assigns, :site_footer_copyright, "")}
+        site_footer_show_newsletter={Map.get(assigns, :site_footer_show_newsletter, true)}
       />
     </.editor_sheet>
     """
@@ -160,6 +172,15 @@ defmodule BerrypodWeb.PageRenderer do
   attr :settings_form, :map, default: nil
   attr :settings_dirty, :boolean, default: false
   attr :settings_save_status, :atom, default: :idle
+  attr :site_header_nav, :list, default: []
+  attr :site_footer_nav, :list, default: []
+  attr :site_social_links, :list, default: []
+  attr :site_announcement_text, :string, default: ""
+  attr :site_announcement_link, :string, default: ""
+  attr :site_announcement_style, :string, default: "info"
+  attr :site_footer_about, :string, default: ""
+  attr :site_footer_copyright, :string, default: ""
+  attr :site_footer_show_newsletter, :boolean, default: true
 
   defp editor_panel_content(%{editor_active_tab: :page} = assigns) do
     ~H"""
@@ -200,6 +221,7 @@ defmodule BerrypodWeb.PageRenderer do
   end
 
   defp editor_panel_content(%{editor_active_tab: :settings} = assigns) do
+    # Legacy settings tab - will be removed once page settings are merged into Page tab
     ~H"""
     <BerrypodWeb.ShopComponents.SettingsEditor.settings_editor
       page={@page}
@@ -213,6 +235,22 @@ defmodule BerrypodWeb.PageRenderer do
     """
   end
 
+  defp editor_panel_content(%{editor_active_tab: :site} = assigns) do
+    ~H"""
+    <BerrypodWeb.ShopComponents.SiteEditor.site_editor
+      site_header_nav={@site_header_nav}
+      site_footer_nav={@site_footer_nav}
+      site_social_links={@site_social_links}
+      site_announcement_text={@site_announcement_text}
+      site_announcement_link={@site_announcement_link}
+      site_announcement_style={@site_announcement_style}
+      site_footer_about={@site_footer_about}
+      site_footer_copyright={@site_footer_copyright}
+      site_footer_show_newsletter={@site_footer_show_newsletter}
+    />
+    """
+  end
+
   # Theme editor content - uses shared component
   attr :theme_editor_settings, :map, default: nil
   attr :theme_editor_active_preset, :atom, default: nil
@@ -467,7 +505,7 @@ defmodule BerrypodWeb.PageRenderer do
   end
 
   defp render_block(%{block: %{"type" => "social_links_card"}} = assigns) do
-    ~H"<.social_links_card />"
+    ~H"<.social_links_card links={assigns[:social_links] || []} />"
   end
 
   defp render_block(%{block: %{"type" => "info_card"}} = assigns) do