Manual audit fixes A/E/F: fuel totalizer, Victor/Jet airways, TIME TO BOD

A — Fuel totalizer (SYSTEM key, renamed from ENGINE): DEC/INC/RST FUEL had no
handler. Now adjust the fuel_totalizer_sum_kg dataref (±1 gal, RST→max fuel) and
the EIS shows the calculated remaining/used. cdiSrc-style writable + demo echo.

E — AIRWAYS: was a single on/off. earth_awy.dat field 8 (airway layer) is now
parsed (1=Victor/low, 2=Jet/high; name-prefix fallback), the bbox returns it, and
the AIRWAYS softkey cycles off→all→Victor→Jet with an AIRWY-LO/-HI label.

F — CURRENT VNV PROFILE now shows TIME TO BOD (bottom of descent) once past the
top of descent, instead of only TIME TO TOD.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/src/components/MFD.jsx

@@ -155,6 +155,17 @@ function EisStrip({ V }) {
       <Bar y={284} label="VAC" min={0} max={10} value={5}
         zones={[{ from: 4.5, to: 5.5, c: '#0c0' }]} />
       <FuelBar y={330} left={fuelL} right={fuelR} />
+      {/* fuel totalizer (SYSTEM → DEC/INC/RST FUEL): pilot-set remaining + used */}
+      {(() => {
+        const rem = num(V.fuelTot) / KG_PER_GAL;
+        const used = Math.max(0, (num(V.fuelMax) - num(V.fuelTot)) / KG_PER_GAL);
+        return (<>
+          <text x="8" y="392" fill="#39d3c0" fontSize="11">CALC</text>
+          <text x="118" y="392" fill="#fff" fontSize="14" textAnchor="end">{rem.toFixed(1)}</text>
+          <text x="124" y="392" fill="#7f8c97" fontSize="10">GAL</text>
+          <text x="182" y="392" fill="#9aa" fontSize="10" textAnchor="end">USED {used.toFixed(0)}</text>
+        </>);
+      })()}
       <text x="8" y="412" fill="#39d3c0" fontSize="12">ENG</text>
       <text x="182" y="412" fill="#fff" fontSize="14" textAnchor="end">{engHrs.toFixed(1)} HRS</text>
       <text x="95" y="438" fill="#39d3c0" fontSize="12" textAnchor="middle">– ELECTRICAL –</text>