expandable volume panel

- Android 15 introduces an expandable volume panel, partial screen sharing, notification cooldown feature, and improvements to Google Messages app for security. - Android 15 is testing using a Pixel device as a webcam, a potential "private space" feature for privacy, and Qualcomm's Snapdragon Satellite technology for satellite messaging capabilities. - Android 15 developer preview hinted at an "audio sharing" feature and edge-to-edge app support for large-screen devices. - Health Connect is expected to see improvements in Android 15 for better sharing of health and wellness data between apps.