fix(printers): don't retract a fan kit on a partial airduct frame

device.airduct is pushed field by field - the modeCur handler reads it with
an "in" check for that reason - so a frame can carry parts without carrying
every fan. Absence in that list is what tells us a kit is not fitted, and
taken from a truncated frame it made both accessory badges vanish mid-print
and started rejecting fan=aux2 on a printer that has the fan.

A parts list now counts as a full inventory only when it carries ids 1 (part
cooling) and 2 (aux). Neither is optional on a machine that reports an
airduct at all, and both appear in every layout in the support-package
archive - P2S base 1,2 / P2S+kit 1,2,3 / X2D 1,2,3,10 / H2C,H2D,H2S 1,2,3,6.
Anything narrower is a diff frame: its speeds are applied, presence is left
alone. Presence can still be added from a partial frame; only retraction
needs the full list, so a kit that really is removed still disappears.

Also compose showChamberFan from both model lists rather than branching
between them, so the P2S/X2D entries in MODELS_WITH_CHAMBER_FAN stay
reachable instead of reading as dead, and note in the fan-speed docstring
that the aux2 gate also rejects between connect and the first airduct push.

static/index.html

@@ -26,8 +26,8 @@
 
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-    <script type="module" crossorigin src="/assets/index-apAuCUp0.js"></script>
-    <link rel="stylesheet" crossorigin href="/assets/index-D4bpNaiw.css">
+    <script type="module" crossorigin src="/assets/index-C2LOlVCR.js"></script>
+    <link rel="stylesheet" crossorigin href="/assets/index-oReXTzKG.css">
   </head>
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     <div id="root"></div>