feat: 添加日历批量操作与客户端时区感知功能，优化前端 UI 交互体验

backend/src/core/agentscope/tools/utils/calendar_domain.py

@@ -118,11 +118,11 @@ def parse_iso_datetime(value: str | None) -> datetime | None:
         return None
     try:
         parsed = datetime.fromisoformat(value.replace("Z", "+00:00"))
-        if parsed.tzinfo is None:
-            parsed = parsed.replace(tzinfo=timezone.utc)
-        return parsed.astimezone(timezone.utc)
-    except ValueError:
-        return None
+    except ValueError as exc:
+        raise ValueError("时间格式必须是 ISO8601 且包含时区偏移") from exc
+    if parsed.tzinfo is None:
+        raise ValueError("时间必须包含时区信息")
+    return parsed.astimezone(timezone.utc)
 
 
 def resolve_share_target_email_map(invitee_user_ids: list[str]) -> dict[str, str]:

backend/src/core/agentscope/tools/utils/calendar_ui.py

@@ -79,7 +79,7 @@ def calendar_read_hints(
             UiHintKvItem(key="page_size", label="每页", value=page_size),
             UiHintKvItem(key="total_pages", label="总页数", value=total_pages),
         ],
-        list_items=event_items,
+        listItems=event_items,
         actions=[
             UiHintAction(
                 label="打开日历",
@@ -97,6 +97,7 @@ def calendar_write_hints(
     message: str,
     event: dict[str, Any] | None,
     event_id: str | None,
+    status: UiHintStatus = UiHintStatus.SUCCESS,
 ) -> UiHintsPayload:
     kv_items: list[UiHintKvItem] = []
 
@@ -126,10 +127,10 @@ def calendar_write_hints(
 
     return UiHintsPayload(
         intent=UiHintIntent.STATUS,
-        status=UiHintStatus.SUCCESS,
+        status=status,
         title="日历操作完成",
         body=message,
-        items=kv_items if kv_items else None,
+        items=kv_items,
         actions=[
             UiHintAction(
                 label="查看日历",
@@ -159,7 +160,5 @@ def calendar_share_hints(
             UiHintKvItem(key="event_id", label="日程ID", value=event_id, copyable=True),
             UiHintKvItem(key="permission", label="权限", value=permission_text),
         ],
-        list_items=[UiHintListItem(title=email) for email in invited]
-        if invited
-        else [],
+        listItems=[UiHintListItem(title=email) for email in invited] if invited else [],
     )