A bell toggle in the header. Rides the same sessions[] the "Recent joins" tile
already renders — no second data source and no re-parsing of the log in JS.
UI-only: no server change, no new egress, no secret, and the container still
reaches nothing but mcnet.
The hard part is not notifying for history, which arrives two ways: the events
buffer is already populated when the page loads, and the monitor's cold-start
backfill re-reads 5000 log lines on every deploy, repopulating the ring with the
SAME events. So newness is a seen-set in localStorage keyed on the log's own
timestamp (time|player|action). That key is stable across both a page reload and
a container restart, where a server-side sequence number would reset to zero and
make every historical event look new.
One subtle ordering bug worth calling out, caught while writing the tests: the
first-response baseline flag must flip unconditionally, not only when fresh
events were found. A returning user has everything already in localStorage, so
their first response yields nothing fresh — flipping the flag lazily would burn
the baseline on their first REAL event instead and silently swallow it.
Notifications are opt-in and off by default; permission is requested from the
bell click (a user gesture), never on load. A denied permission shows a distinct
blocked state, because "I enabled it and nothing happened" is otherwise
indistinguishable from a bug. Bursts (>3 in one poll, e.g. everyone rejoining
after a restart) collapse to one "N joined, M left". Summary polling tightens
from 10s to 5s only while enabled, since the poll interval is the alert latency.
Also fixes a bug this would have introduced: the level-chip click handler bound
to every .chip, which now includes the bell. Scoped to .chip[data-level].
Verified by extracting the shipped block and running it against stubs: silent
baseline, new event notifies, repolling silent, restart-replay silent (both
same-instance and after reload), burst coalescing, the returning-user edge case,
toggle-off still tracks (no backlog when re-enabled), denied permission silent,
and the seen-set staying bounded at 500 newest keys.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
oierandClaude Opus 5
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