Groupchats feature branch (#10181)

Co-authored-by: DS Boyce <260543580+ds-boyce@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/dms/MessageItemEmbed.tsx

@@ -2,14 +2,24 @@ import {memo} from 'react'
 import {useWindowDimensions, View} from 'react-native'
 import {type $Typed, type AppBskyEmbedRecord} from '@atproto/api'
 
-import {atoms as a, native, tokens, useTheme, web} from '#/alf'
+import {atoms as a, native, useTheme, web} from '#/alf'
 import {Embed, PostEmbedViewContext} from '#/components/Post/Embed'
 import {MessageContextProvider} from './MessageContext'
 
+const CLUSTERED_MESSAGE_GAP = 2
+const BORDER_RADIUS = 20
+const SQUARED_BORDER_RADIUS = 4
+
 let MessageItemEmbed = ({
   embed,
+  isFromSelf,
+  squaredTopCorner,
+  squaredBottomCorner,
 }: {
   embed: $Typed<AppBskyEmbedRecord.View>
+  isFromSelf: boolean
+  squaredTopCorner: boolean
+  squaredBottomCorner: boolean
 }): React.ReactNode => {
   const t = useTheme()
   const screen = useWindowDimensions()
@@ -18,7 +28,7 @@ let MessageItemEmbed = ({
     <MessageContextProvider>
       <View
         style={[
-          a.my_xs,
+          isFromSelf ? a.mr_sm : a.ml_sm,
           t.atoms.bg,
           a.rounded_md,
           native({
@@ -30,12 +40,38 @@ let MessageItemEmbed = ({
             minWidth: 280,
             maxWidth: 360,
           }),
+          {
+            marginTop: CLUSTERED_MESSAGE_GAP,
+          },
         ]}>
-        <View style={{marginTop: tokens.space.sm * -1}}>
+        <View style={{marginTop: -8}}>
           <Embed
             embed={embed}
             allowNestedQuotes
             viewContext={PostEmbedViewContext.Feed}
+            style={[
+              a.rounded_xl,
+              a.border_0,
+              isFromSelf
+                ? {
+                    backgroundColor: t.palette.primary_50,
+                    borderBottomRightRadius: squaredBottomCorner
+                      ? SQUARED_BORDER_RADIUS
+                      : BORDER_RADIUS,
+                    borderTopRightRadius: squaredTopCorner
+                      ? SQUARED_BORDER_RADIUS
+                      : BORDER_RADIUS,
+                  }
+                : {
+                    backgroundColor: t.palette.contrast_50,
+                    borderBottomLeftRadius: squaredBottomCorner
+                      ? SQUARED_BORDER_RADIUS
+                      : BORDER_RADIUS,
+                    borderTopLeftRadius: squaredTopCorner
+                      ? SQUARED_BORDER_RADIUS
+                      : BORDER_RADIUS,
+                  },
+            ]}
           />
         </View>
       </View>