chore: more fixes to the thread full class

Author: ambaldwin

src/styles/Thread.scss

@@ -265,6 +265,18 @@
   .str-chat__thread {
     background: transparent;
 
+    &--full {
+      position: fixed;
+      top: 0;
+      right: 0;
+      height: 100vh;
+      background: var(--white);
+      z-index: 1000;
+      margin: 0;
+      width: 100vw;
+      max-width: 100%;
+    }
+
     &-header {
       background: var(--white30);
     }