We can remove a {{theme_mode}}-settings class on the upload button
and access day/night from `.closest("realm-logo-section")`
so that only the outer ID differs between the two widgets.
Part of #14730.
We now trigger realm day/night logo upload by clicking on realm
day/night logo element itself rather than having a big upload button
and to match our user avatar UI. Added new spinner over the logo
element itself to show while uploading realm logo for both day and
night logos.
It's a preliminary step to enable message_retention_setting in org settings
UI, which is a non-limited plan only feature. So we require a page_param
property that tells us the limited-plan state of the Zulip realm.
Users are unable to modify organization's logos, but disabled
buttons for the same are being shown to the user on the organization
settings page. This commit removes those buttons. The file
realm-logo-widget.hbs renders those buttons only if the user is an
admin and realm_logo.js has been updated to allow operations
(like click) on the buttons only to admins.