back to channels to use css grid.
		
			
			While the TODO comment we deleted in left_sidebar.css says we need to rewrite both show more and show less button to grids; show more was already a grid. There have been some very slight changes in the actual size of the back to channels row; those changes make the row more consistent with the rest of the left sidebar rows in terms of sizing. We've introduced a new class called `.hide-more-direct-messages-text` that applies the same properties as the `span` selector used to. We are using a class because of better performance when selecting, see https://chat.zulip.org/#narrow/stream/6-frontend/topic/CSS.20selector.20performance/near/1845719 for more info on the why, The `font-size` was moved inside the above class, so that when setting the line-height of the anchor component, the `em` refers to the normal font size and not the smaller font size for `back to channels`. We've moved the link inside `.direct-messages-section-header` and most of the grid properties are inherited from that element. This is a preparatory commit to introduce DM filter in #30332.
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