Device-level filter for Summary Dashboard site summarization

Summary Dashboards currently aggregate device data at the site level but do not provide a way to select or exclude individual devices within that aggregated view. Users who want to focus on a subset of devices at a site must rely on the full aggregate result, with no mechanism to narrow the displayed devices. This enhancement would add a device selection filter, such as a checkbox list, to site-level summarization widgets so users can choose which devices to include in the displayed results. This would give customers more granular control over site-level reporting, allowing them to focus on relevant devices without needing to build separate dashboard configurations.