Previously the click area to open the settings modal was limited to
just the stream name (just the text). This, inconveniently, created a
lot of empty, unclickable space around the stream name.
This commit resolves the problem by:
* Extracting the title and icon into a separate template as
`navbar_title_and_icon.hbs` and calls this partial in
`tab_bar.hbs`.
* Calling the partial within an <a> tag for stream based narrows
and in a <span> tag for non-stream narrows.
* Making some CSS changes so that everything still renders correctly
(visually).
This commit also:
* Leads us to "piggy back" all stream based narrow elements on the
`stream_settings_link` conditional. (Previously the only "piggy
backing" was by `narrow_description` on `sub_count`, which was
necessary for the rendering of the `(no description)` string.)
The end goal here is that the entire navbar is clickable. This is a
step towards that goal, but some of the margins on the sub count and
its ::before and ::after pseudo-elements still need to be fixed.
YashRE42