chore: fix full class for thread, add class to main panel for window and thread handling

Author: ambaldwin

src/styles/Thread.scss

@@ -136,7 +136,15 @@
         padding-top: 0;
 
         &.str-chat__thread--full {
+          position: fixed;
+          top: 0;
+          right: 0;
+          height: 100vh;
+          background: var(--white);
+          z-index: 1000;
           margin: 0;
+          width: 100vw;
+          max-width: 100%;
         }
 
         .str-chat__gallery {

src/styles/_base.scss

@@ -143,6 +143,10 @@ $emoji-flag-unicode-range: U+1F1E6-1F1FF;
       display: flex;
       flex-direction: column;
       flex: 1;
+
+      &--hideOnThread {
+        display: none;
+      }
     }
 
     .rfu-dropzone {