modify calender id as optional params to create, available and displa…

…y tools in google calendar

src/sayvai_tools/tools/google_calendar/available_slots.py

@@ -43,7 +43,7 @@ def _find_available_slots(
         start_time: datetime,
         end_time: datetime,
         duration_minutes: int,
-        calendar_id: str = "primary",
+        calendar_id: Optional[str] = "primary",
     ) -> List[Tuple[datetime, datetime]]:
         """Find available time slots in the specified Google Calendar.
 

src/sayvai_tools/tools/google_calendar/create_event.py

@@ -53,10 +53,10 @@ def create(cls) -> "CreateEventTool":
 
     def _create_event(
         self,
-        calendar_id: str,
         summary: str,
         start_time: datetime,
         end_time: datetime,
+        calendar_id: Optional[str] = "primary",
         description: Optional[str] = None,
         location: Optional[str] = None,
         attendees: Optional[List[str]] = None,

src/sayvai_tools/tools/google_calendar/display_events.py

@@ -32,8 +32,8 @@ def create(cls) -> "DisplayEventsTool":
 
     def _display_events(
         self,
-        calendar_id: str,
         max_results: int = 10,
+        calendar_id: Optional[str] = "primary",
     ) -> List[dict]:
         """Fetch and display events from a specific calendar.