feat: domain event bus for multi-client sync (issue #26, phase 2)

lib/bds/desktop/shell_data.ex

@@ -91,14 +91,16 @@ defmodule BDS.Desktop.ShellData do
     end
   end
 
-  def editor_meta(task_status) do
+  # Accepts the caller's already-resolved locale so hot render paths never
+  # re-read the ui.language setting from the database.
+  def editor_meta(task_status, ui_language \\ nil) do
     [
       %{
         label: dgettext("ui", "Status"),
         value: task_status.running_task_message || dgettext("ui", "Idle")
       },
       %{label: dgettext("ui", "Mode"), value: dgettext("ui", "Offline")},
-      %{label: dgettext("ui", "Main Language"), value: ui_language()}
+      %{label: dgettext("ui", "Main Language"), value: ui_language || ui_language()}
     ]
   end
 
@@ -107,7 +109,7 @@ defmodule BDS.Desktop.ShellData do
       post_count: dashboard.post_stats.total_posts,
       media_count: dashboard.media_stats.media_count,
       theme_badge: "desktop-shell",
-      ui_language: Keyword.get(opts, :ui_language, ui_language()),
+      ui_language: Keyword.get_lazy(opts, :ui_language, &ui_language/0),
       offline_mode: Keyword.get(opts, :offline_mode, true),
       running_task_message: task_status.running_task_message,
       running_task_overflow: task_status.running_task_overflow,

lib/bds/desktop/shell_live.ex

@@ -6,7 +6,6 @@ defmodule BDS.Desktop.ShellLive do
   import Phoenix.HTML
 
   alias BDS.{AI, Blogmark, BoundedAtoms, Metadata}
-  alias BDS.CliSync.Watcher
   alias BDS.Desktop.{FilePicker, FolderPicker, ShellData, UILocale}
 
   alias BDS.Desktop.ShellLive.{
@@ -151,7 +150,9 @@ defmodule BDS.Desktop.ShellLive do
     connected = connected?(socket)
 
     if connected do
-      Phoenix.PubSub.subscribe(BDS.PubSub, Watcher.topic())
+      # Entity + settings events from every source: in-app contexts, other
+      # connected clients (GUI or TUI), and the CLI sync watcher.
+      :ok = BDS.Events.subscribe()
       Process.send_after(self(), :refresh_task_status, @refresh_interval)
     end
 
@@ -736,6 +737,14 @@ defmodule BDS.Desktop.ShellLive do
     {:noreply, assign(socket, :shell_overlay, overlay)}
   end
 
+  # The UI language is a server-side setting shared by all clients; when any
+  # client (or script) changes it, every shell re-renders in the new locale.
+  def handle_info({:settings_changed, "ui.language"}, socket) do
+    {:noreply, set_page_language(socket, ShellData.ui_language())}
+  end
+
+  def handle_info({:settings_changed, _key}, socket), do: {:noreply, socket}
+
   def handle_info(message, socket) do
     Bridges.handle_info(message, socket, bridges_callbacks())
   end
@@ -981,6 +990,9 @@ defmodule BDS.Desktop.ShellLive do
       socket
     else
       UILocale.put(normalized)
+      # Persist server-side so every client renders the same language; the
+      # resulting settings_changed broadcast is a no-op for this socket.
+      _ = BDS.Settings.put_global_setting("ui.language", normalized)
 
       socket
       |> assign(:page_language, normalized)

lib/bds/desktop/shell_live/bridges.ex

@@ -266,7 +266,7 @@ defmodule BDS.Desktop.ShellLive.Bridges do
 
           socket
           |> assign(:task_status, task_status)
-          |> assign(:editor_meta, ShellData.editor_meta(task_status))
+          |> assign(:editor_meta, ShellData.editor_meta(task_status, socket.assigns.page_language))
           |> assign(
             :status,
             ShellData.status_bar(

lib/bds/desktop/shell_live/socket_state.ex

@@ -38,7 +38,7 @@ defmodule BDS.Desktop.ShellLive.SocketState do
       |> assign(:sidebar_header, active_sidebar_label(activity_buttons, workbench.active_view, sidebar_data))
       |> assign(:panel_tabs, ShellData.panel_tabs(workbench))
       |> assign(:current_tab, current_tab)
-      |> assign(:editor_meta, ShellData.editor_meta(task_status))
+      |> assign(:editor_meta, ShellData.editor_meta(task_status, page_language))
       |> assign(
         :status,
         ShellData.status_bar(workbench, task_status, dashboard,