Add DM conversations mode similar to upstream

app/javascript/flavours/glitch/styles/components/accounts.scss

@@ -46,6 +46,18 @@
     vertical-align: middle;
     margin-right: 5px;
   }
+
+  &-composite {
+    @include avatar-radius;
+    overflow: hidden;
+
+    & div {
+      @include avatar-radius;
+      float: left;
+      position: relative;
+      box-sizing: border-box;
+    }
+  }
 }
 
 .account__avatar-overlay {

app/javascript/flavours/glitch/styles/components/index.scss

@@ -287,8 +287,12 @@
   text-overflow: ellipsis;
   white-space: nowrap;
 
+  a {
+    color: inherit;
+    text-decoration: inherit;
+  }
+
   strong {
-    display: block;
     height: 18px;
     font-size: 16px;
     font-weight: 500;
@@ -308,7 +312,7 @@
     white-space: nowrap;
   }
 
-  &:hover {
+  > a:hover {
     strong {
       text-decoration: underline;
     }

app/javascript/flavours/glitch/styles/components/status.scss

@@ -209,7 +209,7 @@
     outline: 0;
     background: lighten($ui-base-color, 4%);
 
-    .status.status-direct {
+    &.status.status-direct:not(.read) {
       background: lighten($ui-base-color, 12%);
 
       &.muted {
@@ -249,8 +249,9 @@
     margin-top: 8px;
   }
 
-  &.status-direct {
+  &.status-direct:not(.read) {
     background: lighten($ui-base-color, 8%);
+    border-bottom-color: lighten($ui-base-color, 12%);
   }
 
   &.light {
@@ -333,7 +334,7 @@
     &:focus > .status__content:after {
       background: linear-gradient(rgba(lighten($ui-base-color, 4%), 0), rgba(lighten($ui-base-color, 4%), 1));
     }
-    &.status-direct> .status__content:after {
+    &.status-direct:not(.read)> .status__content:after {
       background: linear-gradient(rgba(lighten($ui-base-color, 8%), 0), rgba(lighten($ui-base-color, 8%), 1));
     }
 
@@ -599,7 +600,7 @@
   }
 }
 
-.status__display-name,
+a.status__display-name,
 .reply-indicator__display-name,
 .detailed-status__display-name,
 .account__display-name {