Replace exact blank_to_nil helpers

AUDIT.md

@@ -46,6 +46,7 @@ after each item.
 - [x] `scripting/runtime.ex`
 - [x] `desktop/external_links.ex`
 - [x] `MapUtils.maybe_put/3` replacements
+- [x] `MapUtils.blank_to_nil/1` replacements (exact duplicate sites replaced; trim-sensitive local variants verified keep)
 - [x] `desktop/error_html.ex` (verified keep: still required by Phoenix `render_errors` wiring)
 - [x] `desktop/health_controller.ex` (verified keep: current Phoenix route wiring still expects a controller module)
 - [x] `desktop/folder_picker.ex` (verified keep: no equivalent `Desktop.OS` picker primitive exists to inline onto)

lib/bds/desktop/shell_live/import_editor.ex

@@ -327,7 +327,7 @@ defmodule BDS.Desktop.ShellLive.ImportEditor do
       |> assign(:taxonomy_edit, %{
         type: type,
         name: name,
-        value: mapped_to |> to_string() |> blank_to_nil()
+        value: mapped_to |> to_string() |> BDS.MapUtils.blank_to_nil()
       })
       |> build_data()
 
@@ -1451,6 +1451,4 @@ defmodule BDS.Desktop.ShellLive.ImportEditor do
 
   defp present?(value), do: value not in [nil, ""]
   defp blank?(value), do: value in [nil, ""]
-  defp blank_to_nil(""), do: nil
-  defp blank_to_nil(value), do: value
 end

lib/bds/desktop/shell_live/import_editor/taxonomy_editing.ex

@@ -17,7 +17,7 @@ defmodule BDS.Desktop.ShellLive.ImportEditor.TaxonomyEditing do
         Map.put(socket.assigns.import_editor_taxonomy_edits, definition_id, %{
           type: type,
           name: name,
-          value: mapped_to |> to_string() |> blank_to_nil()
+          value: mapped_to |> to_string() |> BDS.MapUtils.blank_to_nil()
         })
       )
       |> reload.(socket.assigns.workbench)
@@ -150,7 +150,7 @@ defmodule BDS.Desktop.ShellLive.ImportEditor.TaxonomyEditing do
   @spec update_taxonomy_mapping(term(), term(), term(), term()) :: term()
   def update_taxonomy_mapping(report, type, name, mapped_to) do
     bucket_key = if(type == "categories", do: :categories, else: :tags)
-    normalized_value = mapped_to |> to_string() |> String.trim() |> blank_to_nil()
+    normalized_value = mapped_to |> to_string() |> String.trim() |> BDS.MapUtils.blank_to_nil()
 
     updated_report =
       update_in(report, [:items, bucket_key], fn items ->
@@ -229,7 +229,7 @@ defmodule BDS.Desktop.ShellLive.ImportEditor.TaxonomyEditing do
 
   @spec normalize_taxonomy_mapping_value(term(), term(), term()) :: term()
   def normalize_taxonomy_mapping_value(project_id, type, mapped_to) do
-    normalized_value = mapped_to |> to_string() |> String.trim() |> blank_to_nil()
+    normalized_value = mapped_to |> to_string() |> String.trim() |> BDS.MapUtils.blank_to_nil()
 
     case normalized_value do
       nil ->
@@ -285,6 +285,4 @@ defmodule BDS.Desktop.ShellLive.ImportEditor.TaxonomyEditing do
   def maybe_put_option(opts, key, value), do: Keyword.put(opts, key, value)
 
   defp present?(value), do: value not in [nil, ""]
-  defp blank_to_nil(""), do: nil
-  defp blank_to_nil(value), do: value
 end

lib/bds/import_analysis.ex

@@ -175,11 +175,11 @@ defmodule BDS.ImportAnalysis do
       resolution: if(status == "conflict", do: "ignore", else: nil),
       existing_id: existing && existing.id,
       existing_title: existing && existing.title,
-      author: blank_to_nil(wxr_post.creator),
-      excerpt: blank_to_nil(wxr_post.excerpt),
+      author: BDS.MapUtils.blank_to_nil(wxr_post.creator),
+      excerpt: BDS.MapUtils.blank_to_nil(wxr_post.excerpt),
       categories: wxr_post.categories,
       tags: wxr_post.tags,
-      wp_status: blank_to_nil(wxr_post.status),
+      wp_status: BDS.MapUtils.blank_to_nil(wxr_post.status),
       content_markdown: content_markdown,
       content_checksum: content_checksum,
       content_preview: String.slice(content_markdown, 0, 200),
@@ -236,7 +236,7 @@ defmodule BDS.ImportAnalysis do
       existing_id: existing && existing.id,
       existing_title: existing && existing.title,
       mime_type: wxr_media.mime_type,
-      description: blank_to_nil(wxr_media.description),
+      description: BDS.MapUtils.blank_to_nil(wxr_media.description),
       parent_wp_id: wxr_media.parent_id,
       source_file: source_file,
       checksum: checksum,
@@ -546,7 +546,4 @@ defmodule BDS.ImportAnalysis do
     end)
   end
 
-  defp blank_to_nil(nil), do: nil
-  defp blank_to_nil(""), do: nil
-  defp blank_to_nil(value), do: value
 end

lib/bds/wxr_parser.ex

@@ -329,9 +329,9 @@ defmodule BDS.WxrParser do
       slug: item.post_name,
       content: item.content,
       excerpt: item.excerpt,
-      pub_date: blank_to_nil(item.pub_date),
-      post_date: blank_to_nil(item.post_date),
-      post_modified: blank_to_nil(item.post_modified),
+      pub_date: BDS.MapUtils.blank_to_nil(item.pub_date),
+      post_date: BDS.MapUtils.blank_to_nil(item.post_date),
+      post_modified: BDS.MapUtils.blank_to_nil(item.post_modified),
       creator: item.creator,
       status: item.status,
       post_type: item.post_type,
@@ -342,7 +342,7 @@ defmodule BDS.WxrParser do
 
   defp parse_media_item(item) do
     attachment_url = item.attachment_url
-    filename = attachment_url |> Path.basename() |> blank_to_nil() || ""
+    filename = attachment_url |> Path.basename() |> BDS.MapUtils.blank_to_nil() || ""
 
     %{
       wp_id: parse_integer(item.post_id),
@@ -350,7 +350,7 @@ defmodule BDS.WxrParser do
       url: attachment_url,
       filename: filename,
       relative_path: relative_upload_path(attachment_url),
-      pub_date: blank_to_nil(item.pub_date),
+      pub_date: BDS.MapUtils.blank_to_nil(item.pub_date),
       parent_id: parse_integer(item.post_parent),
       mime_type: MIME.from_path(filename),
       description: item.content
@@ -373,6 +373,4 @@ defmodule BDS.WxrParser do
     end
   end
 
-  defp blank_to_nil(""), do: nil
-  defp blank_to_nil(value), do: value
 end