We want to make it easier to find stream details such as creator,
creation date and stream id. The commit replaces the "Email address"
section in General tab of stream overlay with a new section called
"Stream details", "Email address" is now a field in this section.
If the stream does not have a creator, we only show the stream creation
date in creation details.
Fixes: #25648.
For spectators, the chunk of page_params that originates from
do_events_register isn’t assigned until ui_init.js. That means the
TypeScript type of page_params is mostly a lie during module load
time: reading a parameter too early silently results in undefined
rather than the declared type, with unpredictable results later on.
We want to make such an early read into an immediate runtime error,
for both users and spectators consistently, and pave the way for
runtime validation of the page_params type. As a first step, split
out the subset of fields that pertain to the current user.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
