Citation: combined PFD+MFD view, hardware AP look, FMS build-out, fluid easing

- CitDuo: PFD + MFD side-by-side on one tablet screen (new 'PFD+MFD' tab,
  first in the Citation profile) — the two pilot DU-870 tubes at once.
- Autopilot restyled to the real Primus FGC: machined dark bezel w/ corner
  screws, engraved square keys with green annunciator triangles (lit when
  active), ridged pitch thumbwheel.
- FMS more complete per the FMS manual: DEP/ARR now does the two-step
  procedure→transition pick (NO TRANS / RWxx / named transitions), VNAV split
  into CLB/CRZ/DES pages (trans-alt, speed/alt limits, cruise alt, target
  speed, VPA) via PREV/NEXT, and a new PROG page (TO/DEST distance-to-go + ETE
  at GS). Page keys: FPLN/LEGS/DEP-ARR/DIR-INTC/VNAV/PROG/MENU.
- Fluidity: Citation PFD/MFD/EICAS now use the same rAF time-constant easing as
  the G1000 (useEased/useEasedAngle) for attitude, speed/alt/VS tapes, HSI,
  compass, map ownship and N1/ITT gauges — smooth 60 fps instead of stepping.

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

web/src/components/citation/CitMFD.jsx

@@ -1,5 +1,6 @@
 import React, { useState, useEffect, useRef } from 'react';
 import { num } from '../../api/useXplane.js';
+import { useEased, useEasedAngle } from '../../api/ease.js';
 
 // ============================================================================
 // Citation X — Multi-Function Display (Honeywell Primus 2000 arc map).
@@ -35,7 +36,11 @@ export default function CitMFD({ xp }) {
   const etRun = useRef(false);
   useEffect(() => { const id = setInterval(() => etRun.current && setEt((t) => t + 1), 1000); return () => clearInterval(id); }, []);
 
-  const lat = num(V.lat), lon = num(V.lon), hdg = num(V.heading), trk = num(V.track);
+  // smooth ownship + compass (same rAF glide as the G1000 map)
+  const lat = useEased(num(V.lat), 0.14);
+  const lon = useEased(num(V.lon), 0.14);
+  const hdg = useEasedAngle(num(V.heading), 0.10);
+  const trk = num(V.track);
   // arc map geometry: ownship near bottom, ~120° forward arc
   const W = 760, H = 760, cx = W / 2, cy = 600, R = 470;   // compass radius
   const pxPerNm = R / rng;