PLT-6905 - Updating channel header design (#6789)

* PLT-6905 - Updating channel header design

* Updating border-radius

* Updating radius for wide icons

* Updating trigger for overlay

* Updating UI for channel header

* Updating channel header sizing

* Updating channel header css

* Updating sidebar css

* Updating status icons

* Adjusting border

* Updating comment

* Removing type from status icon

* Fixing UI issues for the channel header/sidebar

* make "Add a channel description" open the channel header modal

* Updating status and opacity

* Updating stauts icon positioning

* Updating description and heading size

* Updating UI changes

* Updating UI changes

* add a focused class to the parent div .search__form and then remove when hover away

* Fix active state for pinned posts icon

* Updating UI changes

* Update channel header text

webapp/stores/search_store.jsx

@@ -98,7 +98,7 @@ class SearchStoreClass extends EventEmitter {
         return this.searchTerm;
     }
 
-    storeSearchResults(results, isMentionSearch, isFlaggedPosts, isPinnedPosts) {
+    storeSearchResults(results, isMentionSearch = false, isFlaggedPosts = false, isPinnedPosts = false) {
         this.searchResults = results;
         this.isMentionSearch = isMentionSearch;
         this.isFlaggedPosts = isFlaggedPosts;