[hivecommons-hive]

Static fix for long-lived dashboard tab memory growth.

What leaked / what changed (src/pkg/dashboard/static/index.html):

• Sparkline replay cache: _sparklineLastKeys was an unbounded Map. Some sparkline ids fall back to their title, and the title includes the latest value (for example the KB facts spark and the axis sparks), so every refresh added a new entry plus a serialized series key. It now goes through rememberSparklineKey, an insertion-order LRU capped at SPARKLINE_KEY_CACHE_MAX = 500.
• historyData: added a shared CLIENT_HISTORY_MAX_SAMPLES = 2016 constant (one week at 5-min resolution) and a capHistory() ring-buffer helper. These are applied to the localStorage restore, the SSE push site, fetchHistory's reassignment and mergeTrendHistory's concat. Before, those paths had no bound, and the old push-site shift only dropped one point per event. The unused SPARKLINE_MAX_POINTS was removed.
• Staggered sparkline animations: animateSparklineSvg now returns early for svgs that a re-render detached before the stagger timeout fired, so it no longer animates (and retains) dead nodes.
• EventSource('/api/events'): connect() is now idempotent. It closes any previous source, detaches its handlers and clears a pending reconnect timer. onerror schedules at most one reconnect, so streams cannot stack.
• Campaign Jam WebSocket: the old socket's onmessage/onclose are detached before close() on reconnect, so a stale close handler no longer paints over the live socket.

Audited and already bounded: the overview KPI history (slice(-OVERVIEW_HISTORY_MAX_SAMPLES)), chatCommandHistory, chat DOM/transcript, agent pane / inception / OpenRouter / GH device-flow intervals (clear before re-arm), overview carousel timers (cleared per render), KB graph rAF and fullscreen listener (cancelled and cleaned up per render). _deferredInit intervals run once.

Guard tests (dashboard_history_cap_test.go):

• Every …History.push( site in index.html must be followed by capHistory(...) or a .slice(-N) trim.
• The cap helpers and the bounded key cache stay wired.
• connect() and the Jam socket close the previous connection before reconnecting.

Heap verification (DevTools snapshots over 30 min / a working day in Safari) could not be done headlessly here and is left to operators. The fixes above are from static analysis.

Refs #10557 — closing keyword withheld by the hive watcher: human-filed bug: reporter must confirm the fix before auto-closing (add "hive: reporter-confirmed" to the issue body or apply the same label, or file with "hive: close-on-merge" when the merged fix is the verification); see kubestellar/hive#6781. Merging this PR will not close the issue.

— hive: agent=scanner backend=copilot model=claude-fable-5.1 copilot=1.0.88 requested_by=@clubanderson

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[hivecommons-hive]

hive/awaiting-ci: CI pending — sweep will merge when green.

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🐝 Hive Agent: scanner | Instance: hosted-available-oke-11-placeholder-r05x | SHA: unknown

— hive: agent=scanner backend=copilot model=claude-fable-5.1 copilot=1.0.88

[github-actions]

Open PR overlap check

Base branch: v5

Conflicts are checked with every PR merged onto the current tip of v5, so a PR that only needs a rebase is not reported as conflicting with its siblings.

PR	Title	Relation	Files
#10578	🐛 dashboard: Overview 'Actionable now' matches Governor counts	same files	src/pkg/dashboard/static/index.html
#10576	✨ dashboard: Agents tiles show minute countdown and 'up next' marker	same files	src/pkg/dashboard/static/index.html
#10571	🐛 dashboard: Projects card separates issue buckets from PR buckets	same files	src/pkg/dashboard/static/index.html
#10572	🐛 dashboard: Overview and Governor actionable counts share one definition	same files	src/pkg/dashboard/static/index.html
#10568	🐛 dashboard: cap histories, dedupe intervals, cancel animations to stop tab memory growth	CONFLICT	src/pkg/dashboard/static/index.html
#10579	🐛 dashboard: section titles match sidebar labels	same files	src/pkg/dashboard/static/index.html
#10566	✨ dashboard: Agents tiles show 'up next' and per-agent minute countdown	same files	src/pkg/dashboard/static/index.html

[github-actions]

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