Now: reset every clock face, and be available whenever one is off live

[msupino]

Two reports about the Now button on the map clock, one PR.

1. Now moved the chart dropdown to the wrong sheet — and locked it there

Scrubbing the clock pulls the weather charts to the newest sheet issued by the chosen hour, and pins #wx-time there so the ten-minute re-poll cannot drag a scrubbing pilot back to the present. Coming back to live ran that same code with an offset of zero: the dropdown was pulled to the newest sheet issued by now, and pinned there too.

Those are not the same sheet. The dropdown seeds itself to the sheet nearest now, which can look forward; "newest issued by" can only look back. With sheets published at −2h and +1h:

	Other layers	Chart
Before	live	the 2-hour-old sheet, pinned
After	live	the sheet an hour out, free to advance

The pin was the second half of it: even the re-poll could not correct the map, so it stayed on the stale chart until a reload.

Fix. NavWxTime.live() drops the pin (the pilot's own pick, or the one the scrub set), removes the stored preference — the same thing poll()'s existing release path does, or the next reload resurrects the time the pilot just asked to leave — and re-seeds by the dropdown's own nearest-now rule. pullCharts() calls it at offset zero instead of followInstant, so both ways back to live count: the Now button, and dragging the slider to zero.

2. Now was not available when something other than the slider had moved

Three controls answer to this clock and each can be moved on its own:

Control	Moved by	Lit Now before	Now
Map / inspector time slider	the pilot	✅	✅
#wx-time chart dropdown, in the toolbar	the pilot	❌	✅
Density-altitude slider on an airfield panel	the pilot	❌	✅

Pressing Now already reset all three — scrubbed() cascades through the master into the DA mirrors, and pullCharts() releases the dropdown. Only the enablement was wrong: nowBtn.disabled = h === 0. A pilot who picked a future chart, or dragged the panel's own slider forward, was left looking at a future hour beside a dead button, with no way back but a reload.

offLive() is now the hour, the DA slider on an open panel, and the charts — Now is dead only when all three are at live. Two nuances:

• The dropdown counts only while a chart overlay is actually on: with none up, the selected sheet changes nothing a pilot can see.
• NavWxTime.offLive() compares the selection against the sheet valid now, not against whether a pin exists — choosing the sheet the dropdown had already seeded is not a move off live.

Two events needed wiring. The dropdown already published its changes (onChange), which relabelled the charts line but not the button. The panel's slider changes a value, not the tree, so the MutationObserver watching the panel body never saw it; a delegated input listener does.

Tests

Eight added to tests/map-time-clock.spec.js (27 in the spec). The sheets are published at −2h / +1h / +10h from the moment the test runs, so "nearest now" and "newest issued by now" are provably different options rather than whatever the wall clock happens to make them.

Test	Against the old code
Now returns the sheet valid right now	fails — gives the −2h sheet
Now leaves the dropdown unpinned, still advancing	fails — a newer sheet is ignored
dragging the slider to zero does the same	fails
a chart time the pilot picked lights Now, and Now takes it back	fails — button stays dead
the density-altitude slider lights Now, and Now resets it	fails — button stays dead
a chart time still ahead of live survives a re-seed	passes — guard against over-releasing
a chart time that IS the live sheet leaves Now dead	passes — guard against lighting it for nothing
with no chart layer on, the dropdown does not light Now	passes — same

Each failing case was run against the un-fixed code to confirm it fails there.

Also ran the density-altitude, da-follows-lookahead, mobile-chrome and wx-time-dynamic specs: 70 passed. Shard 2/4 locally: 976 passed.

🤖 Generated with Claude Code

https://claude.ai/code/session_016GmLy5kufzfY8roPqZUBeZ

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