feat(events): the public calendar, event pages and participation history (Phase 14a)

The anonymous surface an event was always for: GET /public/events,
/public/events/:slug and /public/events/series/:slug, plus
GET /player/events/history, and the four screens over them.

Four org-lead decisions taken up front: split Phase 14 into 14a (website)
and 14b (the app); add a `listed` flag rather than letting `state` mean both
schedulable and announced; put the `events` capability string in the version
block rather than publishing core as a pseudo-module; and drop "venue" from
the spec rather than adding a field nothing had ever built.

`listed` is announcement, not permission. Publishing is what makes a
definition runnable, so without a separate flag a surprise event would have
to be advertised in order to be allowed to happen. It is a column, a switch
in Phase 13's editor, and three SQL predicates -- never a filter applied
after a read, which works exactly as well until the first caller that forgets.

The public shapes are a projection, and the projection is the security
boundary: nothing is spread, so a column added to event_runs next year does
not ride out through it. The spec, health, cleanup, claims, errors and
member_key are all absent by construction.

The six public event triggers gained `eventUrl` (version 1 -> 2), carrying
?run= because the page lives at the definition's slug while every trigger is
about one occurrence. notify.event-started gained the button, at seedVersion 2.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016wDDVXWMDz82WqE1i969r4

client/src/routes/player/PlayerPortalLayout.jsx

@@ -39,6 +39,11 @@ const IconShield = () => <Icon><path d="M12 3l7 3v5c0 5-3.5 8-7 10-3.5-2-7-5-7-1
 const IconBell = () => <Icon><path d="M18 8a6 6 0 10-12 0c0 7-3 9-3 9h18s-3-2-3-9" /><path d="M13.7 21a2 2 0 01-3.4 0" /></Icon>
 // The settings row's own icon: a bell would make the two rows read as the same
 // destination twice, which is exactly the confusion the split was meant to end.
+// Participation history (Phase 14a). A calendar rather than a trophy: the row
+// is every event this account attended, ranked or not, and most of them will
+// never have a result published against them at all.
+const IconCalendar = () => <Icon><rect x="3" y="5" width="18" height="16" rx="2" /><path d="M3 10h18M8 3v4M16 3v4" /></Icon>
+
 const IconBellGear = () => <Icon><path d="M18 8a6 6 0 10-12 0c0 7-3 9-3 9h11" /><circle cx="18" cy="18" r="3" /><path d="M18 14v1M18 21v1M14 18h1M21 18h1" /></Icon>
 
 // Exported because Admin -> Navigation edits this list. It stays declared here;
@@ -51,6 +56,7 @@ const IconBellGear = () => <Icon><path d="M18 8a6 6 0 10-12 0c0 7-3 9-3 9h11" />
 // UO module registers it again at `/player/uo/characters`, in this position,
 // with `order: 0`.
 export const NAV = [
+  { to: '/account/events', label: 'Events', icon: IconCalendar },
   { to: '/account/appeals', label: 'Appeals', icon: IconShield },
   { to: '/account/notifications', label: 'Notifications', end: true, icon: IconBell },
   { to: '/account/notifications/settings', label: 'Notification settings', icon: IconBellGear },