feat: Show banner message if Chatwoot update available (#3999)

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Nithin David Thomas <1277421+nithindavid@users.noreply.github.com>
Co-authored-by: Fayaz Ahmed <15716057+fayazara@users.noreply.github.com>
Co-authored-by: Pranav <pranav@chatwoot.com>

app/javascript/dashboard/assets/scss/_layout.scss

@@ -10,10 +10,24 @@ body {
 
 .app-wrapper {
   @include full-height;
+  flex-grow: 0;
+  min-height: 0;
   width: 100%;
 }
 
-.app-root {
+.banner + .app-wrapper {
+  .button--fixed-right-top {
+    top: 5.6 * $space-one;
+  }
+
+  .off-canvas-content {
+    .button--fixed-right-top {
+      top: $space-small;
+    }
+  }
+}
+
+is-closed .app-root {
   @include flex;
   flex-direction: column;
 }
@@ -21,6 +35,7 @@ body {
 .app-content {
   @include flex;
   @include full-height;
+  min-height: 0;
   overflow: hidden;
 }