add legal page editor integration and media library polish

Legal pages (privacy, delivery, terms) now auto-populate content from
shop settings on mount, show auto-generated vs customised badges, and
have a regenerate button. Theme editor gains alt text fields for logo,
header, and icon images. Image picker in page builder now has an upload
button and alt text warning badges. Clearing unused image references
shows an orphan info flash.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/berrypod_web/components/block_editor_components.ex

@@ -471,6 +471,7 @@ defmodule BerrypodWeb.BlockEditorComponents do
   attr :images, :list, required: true
   attr :search, :string, required: true
   attr :event_prefix, :string, default: ""
+  attr :upload, :any, default: nil
 
   def image_picker(assigns) do
     search = String.downcase(assigns.search)
@@ -511,6 +512,16 @@ defmodule BerrypodWeb.BlockEditorComponents do
           autofocus
         />
 
+        <div :if={@upload} class="image-picker-upload">
+          <form phx-change="noop" phx-submit="noop">
+            <label class="image-picker-upload-label">
+              <.icon name="hero-arrow-up-tray" class="size-4" />
+              <span>Upload new image</span>
+              <.live_file_input upload={@upload} class="hidden" />
+            </label>
+          </form>
+        </div>
+
         <div class="image-picker-grid">
           <button
             :for={image <- @filtered_images}
@@ -532,6 +543,13 @@ defmodule BerrypodWeb.BlockEditorComponents do
               />
             <% end %>
             <span class="image-picker-item-name">{image.filename}</span>
+            <span
+              :if={!image.alt || image.alt == ""}
+              class="image-picker-item-no-alt"
+              title="Missing alt text"
+            >
+              <.icon name="hero-exclamation-triangle-mini" class="size-3" />
+            </span>
           </button>
 
           <p :if={@filtered_images == []} class="image-picker-empty">