The dashboard cold-loaded its derived stores (approvals, questions,
containers, …) from /api/state once, then relied solely on live SSE
events. Events that fired during a disconnect window (reconnect,
hive-c0re restart) are never replayed, so the dashboard drifted stale
until a manual reload.
- terminal.js: add onStreamOpen, fired on every EventSource open
(initial + reconnect); the dashboard wires it to refreshState() so
every connection epoch re-syncs the authoritative snapshot.
- terminal.js: seq-dedupe only event kinds that actually appeared in
the history replay. Mutation events are never in /dashboard/history,
so deduping them against the broker-history seq wrongly dropped ones
that fired between the /api/state snapshot and the history fetch.
- app.js: make applyApprovalResolved / applyQuestionResolved
idempotent (guard the history unshift by id) so a re-sync
overlapping a live event can't double a history row.
closes#163
