UI changes (#6876)

* PLT-7011 - Long channel name truncation

* PLT-7013 - Fixing channel header mobile

* PLT-7012 - Updating quick switch modal on mobile

* PLT-7008 - Channel preferences mobile fix

* PLT-7014 - Increasing tap area for channel desc

webapp/sass/layout/_navigation.scss

@@ -104,13 +104,13 @@
             padding: 0 .5em;
 
             .heading {
-                color: $white;
                 display: inline-block;
                 font-weight: 600;
                 line-height: 50px;
                 margin-right: 5px;
                 max-width: calc(100% - 200px);
                 overflow: hidden;
+                text-overflow: ellipsis;
                 vertical-align: top;
             }