Fix responsive message images

Constrain image attachments to their parent while preserving their aspect ratio.

src/app/components/message/MsgTypeRenderers.tsx

@@ -262,7 +262,7 @@ export function MImage({ content, renderImageContent, outlined }: MImageProps) {
       <AttachmentBox
         style={{
           width: toRem(width),
-          height: toRem(height),
+          aspectRatio: `${width} / ${height}`,
           ['--media-h' as string]: `${height}px`,
         }}
         data-paarrot-media-height={height}

src/app/components/message/attachment/Attachment.css.ts

@@ -8,7 +8,7 @@ export const Attachment = recipe({
     color: color.SurfaceVariant.OnContainer,
     borderRadius: config.radii.R400,
     overflow: 'hidden',
-    maxWidth: toRem(400),
+    maxWidth: `min(100%, ${toRem(400)})`,
   },
   variants: {
     outlined: {
@@ -33,7 +33,7 @@ export const AttachmentHeader = style({
 export const AttachmentBox = style([
   DefaultReset,
   {
-    maxWidth: toRem(400),
+    maxWidth: `min(100%, ${toRem(400)})`,
     maxHeight: toRem(400),
     overflow: 'hidden',
   },