feat(viewer): label-gated viewer commands and window creation

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

app/src-tauri/src/lib.rs

@@ -241,6 +241,7 @@ pub fn run() {
             lifecycle,
             pending_settings_import: Arc::new(tokio::sync::Mutex::new(None)),
         })
+        .manage(file_viewer::registry::ViewerRegistry::default())
         .setup(move |app| {
             match tauri::image::Image::from_bytes(include_bytes!("../icons/icon.png")) {
                 Ok(icon) => {
@@ -546,6 +547,13 @@ pub fn run() {
             commands::file_commands::read_container_file,
             commands::file_commands::rename_container_path,
             commands::file_commands::create_container_directory,
+            // Terminal file viewer
+            commands::file_viewer_commands::open_file_viewer,
+            commands::file_viewer_commands::viewer_get_state,
+            commands::file_viewer_commands::viewer_choose_file,
+            commands::file_viewer_commands::viewer_read_file,
+            commands::file_viewer_commands::viewer_poll_file,
+            commands::file_viewer_commands::viewer_write_file,
             // AWS
             commands::aws_commands::aws_sso_refresh,
             // Updates