fix(map): ignore stale async work and keep Path Inspector controls usable

[dborup]

Problem

public/map.js starts asynchronous node/config loads and delayed invalidateSize() work that can complete after the map page is destroyed or replaced. A simple if (map) guard is insufficient because an old callback can mutate a newly created global map. Multiple loadNodes() calls on one instance can also resolve out of order.

The Path Inspector/control layout additionally overlaps or becomes inaccessible at affected desktop/tablet widths.

Upstream reference: Kpa-clawbot/CoreScope#2048.

Acceptance criteria

• Give every map mount a generation/lifecycle token and every same-instance node load a request generation.
• Async results and delayed callbacks affect only their active generation; only the newest same-instance load renders.
• Destroy cancels timers/listeners where practical and makes remaining work inert.
• Old work cannot clear, recenter, or populate a later map.
• Path Inspector controls remain visible, non-overlapping, and clickable at supported tablet/desktop widths.
• Preserve route rendering, filters, saved viewport, and selected-node behavior.

Tests

Cover navigation during pending requests, quick return, reverse-resolution loads, stale invalidateSize, representative tablet/desktop/short-desktop layouts, and blocked clicks/console errors.

Non-goals

No broad map redesign, data semantic change, or deploy.

[dborup]

Draft PR #139 klar til review: CI grøn efter én genkørsel af en intermitterende analytics-layouttest (se PR-kommentaren). Hver kortmontering får nu et livscyklus-token, og hvert loadNodes()-kald får et requestnummer. Svar og timere fra en nedlagt eller ældre montering gør intet, og destroy() rydder timere og AreaFilter-lyttere op. Map Controls holdes fri af Path Inspector ved 641–1440 px. Test: 0/12 på master, 12/12 med rettelsen.

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Generated by Claude Code

[dborup]

Fixed by #139 (merged as 571fb2c8). Known, pre-existing limitation left out: #mapPaneToggle is covered in route mode (route-view.css left:320px); nits from review: three rAF callbacks in route-view.js are not routed through the new guard (wrapped in try/catch), and the resize-handle document listener is never removed. The dead Path Inspector branch is tracked in #143.