### Fixes

- DM screen: bottom gap on initial open tightened — the last message now sits directly above the input bar. The keyboard-closed padding was double-counting the input bar's own layout slot, leaving a large empty gap every time you opened a chat
- DM image lightbox: photos now actually show rounded corners — the viewer container is sized to the image's real aspect ratio (via onLoad), so the rounding lands on the visible photo instead of the empty letterbox margins of a fixed square

### Features

- DM image lightbox: tap a shared photo → opens with a "Save" button that stores the image to your Photos library (downloads remote images first, asks for photo-add permission once). Localized DE/EN/FR/AR