v1.9.0

feat: PhotoCropDialog for image attachments

- New PhotoCropDialog component (skill photo-crop): crop + compress
  images to WebP/JPEG before upload. Features: EXIF orientation fix,
  keyboard a11y, zoom scroll/pinch, configurable ratios (4:3/16:9/1:1/
  free), multi-step downsampling, file size indicator, double-tap reset.
- Images go through cropper, non-images upload directly as before.
- CSP: added blob: to img-src for createObjectURL previews.
- i18n: crop.* keys in ES/EN.