v2.19.5-beta

Image attachment polish

• Small images are no longer upscaled into a blurry block — the inline image now scales down only, keeping its natural size.
• The image is decoded off the UI thread, so the chat no longer freezes for a beat when a multi-MB image loads.
• Image attachments show a sized 'Loading image…' placeholder while their blob loads, instead of flashing the grey file-name chip and then jumping. The file chip only appears for non-image files or when an image genuinely fails to load.