Replace abandoned earmark with mdex for markdown rendering

lib/bds/desktop/shell_live/chat_editor.ex

@@ -546,9 +546,9 @@ defmodule BDS.Desktop.ShellLive.ChatEditor do
   @spec markdown_html(binary()) :: Phoenix.HTML.Safe.t()
   def markdown_html(content) when is_binary(content) do
     html =
-      case Earmark.as_html(content, escape: true) do
-        {:ok, rendered, _messages} -> rendered
-        {:error, rendered, _messages} -> rendered
+      case MDEx.to_html(content) do
+        {:ok, rendered} -> rendered
+        {:error, _reason} -> ""
       end
       |> rewrite_external_images()
 

lib/bds/desktop/shell_live/misc_editor.ex

@@ -279,9 +279,9 @@ defmodule BDS.Desktop.ShellLive.MiscEditor do
   @spec markdown_html(String.t()) :: Phoenix.HTML.safe()
   def markdown_html(content) do
     html =
-      case Earmark.as_html(content || "", escape: true) do
-        {:ok, rendered, _messages} -> rendered
-        {:error, rendered, _messages} -> rendered
+      case MDEx.to_html(content || "") do
+        {:ok, rendered} -> rendered
+        {:error, _reason} -> ""
       end
 
     raw(html)

lib/bds/rendering/filters.ex

@@ -180,9 +180,12 @@ defmodule BDS.Rendering.Filters do
   end
 
   defp render_markdown_html(markdown) do
-    case Earmark.as_html(markdown) do
-      {:ok, html, _messages} -> html
-      {:error, html, _messages} -> html
+    # Macros above inject raw HTML (gallery, video embeds), so the render path
+    # must pass HTML through untouched. unsafe: true matches the prior Earmark
+    # no-escape behavior.
+    case MDEx.to_html(markdown, render: [unsafe: true]) do
+      {:ok, html} -> html
+      {:error, _reason} -> markdown
     end
   end