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>

test/berrypod/legal_pages_test.exs

@@ -252,4 +252,96 @@ defmodule Berrypod.LegalPagesTest do
       assert List.last(blocks).type == :closing
     end
   end
+
+  # ---------------------------------------------------------------------------
+  # regenerate_legal_content/1
+  # ---------------------------------------------------------------------------
+
+  describe "regenerate_legal_content/1" do
+    test "returns a non-empty string for privacy" do
+      result = LegalPages.regenerate_legal_content("privacy")
+      assert is_binary(result)
+      assert String.length(result) > 100
+    end
+
+    test "returns a non-empty string for delivery" do
+      result = LegalPages.regenerate_legal_content("delivery")
+      assert is_binary(result)
+      assert String.length(result) > 100
+    end
+
+    test "returns a non-empty string for terms" do
+      result = LegalPages.regenerate_legal_content("terms")
+      assert is_binary(result)
+      assert String.length(result) > 100
+    end
+  end
+
+  # ---------------------------------------------------------------------------
+  # rich_text_to_plain/1
+  # ---------------------------------------------------------------------------
+
+  describe "rich_text_to_plain/1" do
+    test "converts headings to markdown-style" do
+      blocks = [%{type: :heading, text: "Hello"}]
+      assert LegalPages.rich_text_to_plain(blocks) == "## Hello"
+    end
+
+    test "converts paragraphs as-is" do
+      blocks = [%{type: :paragraph, text: "Some text here."}]
+      assert LegalPages.rich_text_to_plain(blocks) == "Some text here."
+    end
+
+    test "converts lists to bullet points" do
+      blocks = [%{type: :list, items: ["One", "Two", "Three"]}]
+      assert LegalPages.rich_text_to_plain(blocks) == "• One\n• Two\n• Three"
+    end
+
+    test "converts lead blocks" do
+      blocks = [%{type: :lead, text: "Important intro"}]
+      assert LegalPages.rich_text_to_plain(blocks) == "Important intro"
+    end
+
+    test "converts updated_at blocks" do
+      blocks = [%{type: :updated_at, date: "28 February 2026"}]
+      assert LegalPages.rich_text_to_plain(blocks) == "Last updated: 28 February 2026"
+    end
+
+    test "joins multiple blocks with double newlines" do
+      blocks = [
+        %{type: :heading, text: "Title"},
+        %{type: :paragraph, text: "Body text."}
+      ]
+
+      assert LegalPages.rich_text_to_plain(blocks) == "## Title\n\nBody text."
+    end
+
+    test "skips unknown block types" do
+      blocks = [
+        %{type: :heading, text: "Title"},
+        %{type: :unknown_thing, data: "whatever"},
+        %{type: :paragraph, text: "Body."}
+      ]
+
+      assert LegalPages.rich_text_to_plain(blocks) == "## Title\n\nBody."
+    end
+  end
+
+  # ---------------------------------------------------------------------------
+  # legal_slug?/1
+  # ---------------------------------------------------------------------------
+
+  describe "legal_slug?/1" do
+    test "returns true for legal page slugs" do
+      assert LegalPages.legal_slug?("privacy")
+      assert LegalPages.legal_slug?("delivery")
+      assert LegalPages.legal_slug?("terms")
+    end
+
+    test "returns false for non-legal slugs" do
+      refute LegalPages.legal_slug?("home")
+      refute LegalPages.legal_slug?("about")
+      refute LegalPages.legal_slug?("contact")
+    end
+  end
 end