- Expired messages stay readable under a collapsed "Earlier" section, as
long as the feed keeps them (12 months, at most 50). They never count as
unread or raise a banner; withdrawn ones are gone everywhere.
- Each message is one row (level, date, title) that opens in place.
Unread ones carry a dot and a New chip, and opening one is what marks
it read; the banner's Read more opens the panel on its message.
- A fetch that brings a newer feed broadcasts an empty
announcements_changed event, so open pages show the new dot and banner
without a reload.
- The sidebar entry is a megaphone icon with an unread badge, in the
footer row left of System. Footer icons are 32px with no gap so seven
fit an expanded sidebar; with authentication on, logout used to wrap
onto a line of its own.
maziggy
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