replace admin rail with unified bottom sheet editor

- add editor sheet component anchored bottom (mobile) / right (desktop)
- admin cog moves to header, always visible for admins
- remove Done button from editor header, keep only Save
- add editor_at_defaults tracking to disable Reset when at defaults
- sheet collapses on click outside or Escape, stays in edit mode
- dirty indicator + beforeunload warning for unsaved changes
- keyboard shortcuts: Ctrl+Z undo, Ctrl+Shift+Z redo
- WCAG compliant: aria-expanded, live region, focus management

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

lib/berrypod_web/page_editor_hook.ex

@@ -16,10 +16,10 @@ defmodule BerrypodWeb.PageEditorHook do
   """
 
   import Phoenix.Component, only: [assign: 3]
-  import Phoenix.LiveView, only: [attach_hook: 4, put_flash: 3, push_navigate: 2]
+  import Phoenix.LiveView, only: [attach_hook: 4, push_navigate: 2]
 
   alias Berrypod.Pages
-  alias Berrypod.Pages.{BlockEditor, BlockTypes}
+  alias Berrypod.Pages.{BlockEditor, BlockTypes, Defaults}
 
   def on_mount(:mount_page_editor, _params, _session, socket) do
     socket =
@@ -27,6 +27,7 @@ defmodule BerrypodWeb.PageEditorHook do
       |> assign(:editing, false)
       |> assign(:editing_blocks, nil)
       |> assign(:editor_dirty, false)
+      |> assign(:editor_at_defaults, true)
       |> assign(:editor_history, [])
       |> assign(:editor_future, [])
       |> assign(:editor_expanded, MapSet.new())
@@ -36,10 +37,12 @@ defmodule BerrypodWeb.PageEditorHook do
       |> assign(:editor_live_region_message, nil)
       |> assign(:editor_current_path, nil)
       |> assign(:editor_sidebar_open, true)
+      |> assign(:editor_sheet_state, :collapsed)
       |> assign(:editor_image_picker_block_id, nil)
       |> assign(:editor_image_picker_field_key, nil)
       |> assign(:editor_image_picker_images, [])
       |> assign(:editor_image_picker_search, "")
+      |> assign(:editor_save_status, :idle)
       |> attach_hook(:editor_params, :handle_params, &handle_editor_params/3)
       |> attach_hook(:editor_events, :handle_event, &handle_editor_event/3)
       |> attach_hook(:editor_info, :handle_info, &handle_editor_info/2)
@@ -47,50 +50,48 @@ defmodule BerrypodWeb.PageEditorHook do
     {:cont, socket}
   end
 
-  # ── handle_params: detect ?edit=true ─────────────────────────────
+  # ── handle_params: track current path ────────────────────────────
 
   defp handle_editor_params(_params, uri, socket) do
     parsed = URI.parse(uri)
-    query = URI.decode_query(parsed.query || "")
-    wants_edit = query["edit"] == "true"
 
-    # Always store the current path for the edit button and "done" navigation
-    socket = assign(socket, :editor_current_path, parsed.path)
-
-    cond do
-      wants_edit and socket.assigns.is_admin and socket.assigns[:page] ->
-        # Page already loaded — enter edit mode and halt (no need for module handle_params)
-        {:halt, enter_edit_mode(socket)}
-
-      wants_edit and socket.assigns.is_admin ->
-        # Page not loaded yet (e.g. Shop.Content loads in handle_params),
-        # defer initialisation until after the LiveView sets @page
-        send(self(), :editor_deferred_init)
-        {:cont, assign(socket, :editing, true)}
-
-      socket.assigns.editing and not wants_edit ->
-        # Exiting edit mode — halt since we've handled the transition
-        {:halt, exit_edit_mode(socket)}
-
-      true ->
-        {:cont, socket}
-    end
+    # Store the current path for reference (e.g. the Done button)
+    {:cont, assign(socket, :editor_current_path, parsed.path)}
   end
 
-  # ── handle_info: deferred init ───────────────────────────────────
+  # ── handle_info ─────────────────────────────────────────────────
 
-  defp handle_editor_info(:editor_deferred_init, socket) do
-    if socket.assigns.editing and is_nil(socket.assigns.editing_blocks) and socket.assigns[:page] do
-      {:halt, enter_edit_mode(socket)}
-    else
-      {:cont, socket}
-    end
+  defp handle_editor_info(:editor_clear_save_status, socket) do
+    {:halt, assign(socket, :editor_save_status, :idle)}
   end
 
   defp handle_editor_info(_msg, socket), do: {:cont, socket}
 
   # ── handle_event: editor_* events ────────────────────────────────
 
+  # toggle_editing can be called even when not editing (to enter edit mode)
+  defp handle_editor_event("editor_toggle_editing", _params, socket) do
+    if socket.assigns.is_admin and socket.assigns[:page] do
+      if socket.assigns.editing do
+        {:halt, exit_edit_mode(socket)}
+      else
+        {:halt, enter_edit_mode(socket)}
+      end
+    else
+      {:cont, socket}
+    end
+  end
+
+  # set_sheet_state can be called even when not editing (from JS click-outside)
+  defp handle_editor_event("editor_set_sheet_state", %{"state" => state_str}, socket) do
+    if socket.assigns.is_admin and socket.assigns[:page] do
+      state = if state_str == "open", do: :open, else: :collapsed
+      {:halt, assign(socket, :editor_sheet_state, state)}
+    else
+      {:cont, socket}
+    end
+  end
+
   defp handle_editor_event("editor_" <> action, params, socket) do
     if socket.assigns.editing do
       handle_editor_action(action, params, socket)
@@ -330,6 +331,7 @@ defmodule BerrypodWeb.PageEditorHook do
     case socket.assigns.editor_history do
       [prev | rest] ->
         future = [socket.assigns.editing_blocks | socket.assigns.editor_future]
+        at_defaults = Defaults.matches_defaults?(socket.assigns.page.slug, prev)
 
         socket =
           socket
@@ -337,6 +339,7 @@ defmodule BerrypodWeb.PageEditorHook do
           |> assign(:editor_history, rest)
           |> assign(:editor_future, future)
           |> assign(:editor_dirty, true)
+          |> assign(:editor_at_defaults, at_defaults)
           |> assign(:editor_live_region_message, "Undone")
           |> reload_block_data(prev)
 
@@ -351,6 +354,7 @@ defmodule BerrypodWeb.PageEditorHook do
     case socket.assigns.editor_future do
       [next | rest] ->
         history = [socket.assigns.editing_blocks | socket.assigns.editor_history]
+        at_defaults = Defaults.matches_defaults?(socket.assigns.page.slug, next)
 
         socket =
           socket
@@ -358,6 +362,7 @@ defmodule BerrypodWeb.PageEditorHook do
           |> assign(:editor_history, history)
           |> assign(:editor_future, rest)
           |> assign(:editor_dirty, true)
+          |> assign(:editor_at_defaults, at_defaults)
           |> assign(:editor_live_region_message, "Redone")
           |> reload_block_data(next)
 
@@ -376,39 +381,32 @@ defmodule BerrypodWeb.PageEditorHook do
     case Pages.save_page(page.slug, %{title: page.title, blocks: blocks}) do
       {:ok, _saved_page} ->
         updated_page = Pages.get_page(page.slug)
+        at_defaults = Defaults.matches_defaults?(page.slug, updated_page.blocks)
+        Process.send_after(self(), :editor_clear_save_status, 2500)
 
         socket =
           socket
           |> assign(:page, updated_page)
           |> assign(:editing_blocks, updated_page.blocks)
           |> assign(:editor_dirty, false)
+          |> assign(:editor_at_defaults, at_defaults)
           |> assign(:editor_history, [])
           |> assign(:editor_future, [])
-          |> put_flash(:info, "Page saved")
+          |> assign(:editor_save_status, :saved)
 
         {:halt, socket}
 
       {:error, _changeset} ->
-        {:halt, put_flash(socket, :error, "Failed to save page")}
+        {:halt, assign(socket, :editor_save_status, :error)}
     end
   end
 
   defp handle_editor_action("reset_defaults", _params, socket) do
     slug = socket.assigns.page.slug
-    :ok = Pages.reset_page(slug)
-    page = Pages.get_page(slug)
+    default_blocks = Berrypod.Pages.Defaults.for_slug(slug).blocks
 
-    socket =
-      socket
-      |> assign(:page, page)
-      |> assign(:editing_blocks, page.blocks)
-      |> assign(:editor_dirty, false)
-      |> assign(:editor_history, [])
-      |> assign(:editor_future, [])
-      |> reload_block_data(page.blocks)
-      |> put_flash(:info, "Page reset to defaults")
-
-    {:halt, socket}
+    # Treat reset like any other mutation: push to history, mark dirty
+    {:halt, apply_mutation(socket, default_blocks, "Reset to defaults", :content)}
   end
 
   defp handle_editor_action("done", _params, socket) do
@@ -424,11 +422,13 @@ defmodule BerrypodWeb.PageEditorHook do
   defp enter_edit_mode(socket) do
     page = socket.assigns.page
     allowed = BlockTypes.allowed_for(page.slug)
+    at_defaults = Defaults.matches_defaults?(page.slug, page.blocks)
 
     socket
     |> assign(:editing, true)
     |> assign(:editing_blocks, page.blocks)
     |> assign(:editor_dirty, false)
+    |> assign(:editor_at_defaults, at_defaults)
     |> assign(:editor_history, [])
     |> assign(:editor_future, [])
     |> assign(:editor_expanded, MapSet.new())
@@ -437,10 +437,12 @@ defmodule BerrypodWeb.PageEditorHook do
     |> assign(:editor_allowed_blocks, allowed)
     |> assign(:editor_live_region_message, nil)
     |> assign(:editor_sidebar_open, true)
+    |> assign(:editor_sheet_state, :open)
     |> assign(:editor_image_picker_block_id, nil)
     |> assign(:editor_image_picker_field_key, nil)
     |> assign(:editor_image_picker_images, [])
     |> assign(:editor_image_picker_search, "")
+    |> assign(:editor_save_status, :idle)
   end
 
   defp exit_edit_mode(socket) do
@@ -456,22 +458,27 @@ defmodule BerrypodWeb.PageEditorHook do
     |> assign(:editor_allowed_blocks, nil)
     |> assign(:editor_live_region_message, nil)
     |> assign(:editor_sidebar_open, true)
+    |> assign(:editor_sheet_state, :collapsed)
     |> assign(:editor_image_picker_block_id, nil)
     |> assign(:editor_image_picker_field_key, nil)
     |> assign(:editor_image_picker_images, [])
     |> assign(:editor_image_picker_search, "")
+    |> assign(:editor_save_status, :idle)
   end
 
   defp apply_mutation(socket, new_blocks, message, type) do
     history =
       [socket.assigns.editing_blocks | socket.assigns.editor_history] |> Enum.take(50)
 
+    at_defaults = Defaults.matches_defaults?(socket.assigns.page.slug, new_blocks)
+
     socket =
       socket
       |> assign(:editing_blocks, new_blocks)
       |> assign(:editor_history, history)
       |> assign(:editor_future, [])
       |> assign(:editor_dirty, true)
+      |> assign(:editor_at_defaults, at_defaults)
       |> assign(:editor_live_region_message, message)
 
     case type do