feat: complete change to gettext from homebrew i18n solution

lib/bds/desktop/shell_live/chat_surface.ex

@@ -3,7 +3,7 @@ defmodule BDS.Desktop.ShellLive.ChatSurface do
 
   import Phoenix.Component, only: [assign: 3]
 
-  alias BDS.Desktop.ShellData
+  use Gettext, backend: BDS.Gettext
 
   def assistant_turn(prompt, socket) do
     [
@@ -12,12 +12,12 @@ defmodule BDS.Desktop.ShellLive.ChatSurface do
     ]
   end
 
-  def assistant_project_name(nil), do: translated("Projects")
+  def assistant_project_name(nil), do: dgettext("ui", "Projects")
   def assistant_project_name(project), do: project.name
 
-  def assistant_message_label("assistant"), do: translated("Assistant")
-  def assistant_message_label("user"), do: translated("You")
-  def assistant_message_label(_role), do: translated("Assistant")
+  def assistant_message_label("assistant"), do: dgettext("ui", "Assistant")
+  def assistant_message_label("user"), do: dgettext("ui", "You")
+  def assistant_message_label(_role), do: dgettext("ui", "Assistant")
 
   def assistant_message_testid(role), do: "assistant-message-#{role}"
 
@@ -30,19 +30,9 @@ defmodule BDS.Desktop.ShellLive.ChatSurface do
 
   defp assistant_reply(socket) do
     if socket.assigns.offline_mode do
-      ShellData.translate(
-        "Automatic AI actions stay gated by airplane mode.",
-        %{},
-        socket.assigns.page_language
-      )
+      BDS.Gettext.lgettext(socket.assigns.page_language, "ui", "Automatic AI actions stay gated by airplane mode.")
     else
-      ShellData.translate(
-        "The assistant sidebar chat surface is ready, but model execution is not connected yet.",
-        %{},
-        socket.assigns.page_language
-      )
+      BDS.Gettext.lgettext(socket.assigns.page_language, "ui", "The assistant sidebar chat surface is ready, but model execution is not connected yet.")
     end
   end
-
-  defp translated(text), do: ShellData.translate(text, %{}, BDS.Desktop.UILocale.current())
 end