Earlier, if pm_list or stream_list was zoomed in and hitting `q`
hotkey would seemingly do nothing but in the background would add
highlighted class to `stream_row` and toggle stream-list-filter.
This commit fixes this behaviour by bringing focus to currently
visible input filter field.
This commit replaces the spectrum color picker used in the stream
popover and stream settings with a custom color picker popover, which
contains a grid of predefined color swatches and a custom color option.
The custom color option uses the HTML5 <input type="color"> which shows
the native browser color picker UI.
Fixes#14961.
Forward message starts a new message with the quoted context
(message or selection).
The compose box opens with then channel picker open and no topic.
Also added documentation about this feature in the help center.
Fixes part 2 of #31953
