Start live worker in viewer process

Needed for live loading of AI backend modules

src/calibre/gui2/viewer/lookup.py

@@ -428,6 +428,8 @@ class Lookup(QTabWidget):
     def _activate_llm_panel(self):
         if self.llm_panel is None:
             # Deferred import to avoid circular dependencies and improve startup time; import may be redundant
+            from calibre.live import start_worker
+            start_worker()  # needed for live loading of AI backends
             from calibre.gui2.viewer.llm import LLMPanel
             self.llm_panel = LLMPanel(self, viewer=self.viewer, lookup_widget=self)
 

src/calibre/gui2/viewer/ui.py

@@ -51,6 +51,7 @@ from calibre.gui2.viewer.search import SearchPanel
 from calibre.gui2.viewer.toc import TOC, TOCSearch, TOCView
 from calibre.gui2.viewer.toolbars import ActionsToolBar
 from calibre.gui2.viewer.web_view import WebView, get_path_for_name, set_book_path
+from calibre.live import async_stop_worker
 from calibre.startup import connect_lambda
 from calibre.utils.date import utcnow
 from calibre.utils.img import image_from_path
@@ -810,6 +811,7 @@ class EbookViewer(MainWindow):
                 self.web_view.prepare_for_close()
             return
         self.shutting_down = True
+        wait_for_worker = async_stop_worker()
         self.search_widget.shutdown()
         self.web_view.shutdown()
         try:
@@ -822,6 +824,7 @@ class EbookViewer(MainWindow):
         except Exception:
             import traceback
             traceback.print_exc()
+        wait_for_worker()
         self.shutdown_done = True
         return MainWindow.closeEvent(self, ev)
     # }}}