Fix search input stealing focus on app launch - explicitly focus main widget

src/calendar/app.py

@@ -236,6 +236,9 @@ class CalendarApp(App):
         self._update_status()
         self._update_title()
 
+        # Focus the week grid (not the hidden search input)
+        self.query_one("#week-grid", WeekGrid).focus()
+
     def _on_ipc_message(self, message: IPCMessage) -> None:
         """Handle IPC messages from sync daemon."""
         if message.event == "refresh":