[Feature] Generate Stickers from Photos on Mobile App

I have searched the existing feature requests, both open and closed, to make sure this is not a duplicate request. • Yes The feature It would be a fantastic addition to have a feature that allows users to extract the foreground/subject of a picture to create stickers, similar to the functionality currently available in Google Photos or the native iOS Photos app. Instead of running heavy foreground/background detection models on the Immich server, the mobile app could potentially leverage the local AI/ML resources and native APIs of modern smartphones (e.g., Google Pixel, Samsung Galaxy, or newer iPhones). Since these devices already have built-in, highly optimized hardware (NPUs) for subject cutout, it would keep the server load low and make the feature lightning-fast. This is a very popular feature for everyday use, especially when sharing pictures in messengers. Having this capability directly inside the Immich app would significantly increase the WAF (Wife Acceptance Fac…