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/components/sidebar_header.jsx

@@ -102,8 +102,8 @@ export default class SidebarHeader extends React.Component {
             <div className='team__header theme'>
                 {tutorialTip}
                 <div className='header__info'>
-                    <div className='user__name'>{'@' + this.props.currentUser.username}</div>
                     {teamNameWithToolTip}
+                    <div className='user__name'>{'@' + this.props.currentUser.username}</div>
                 </div>
                 <SidebarHeaderDropdown
                     ref='dropdown'