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/App.jsx

@@ -14,6 +14,7 @@ import AudioPanel from './components/AudioPanel.jsx';
 import KAP140 from './components/KAP140.jsx';
 import CitPFD from './components/citation/CitPFD.jsx';
 import CitMFD from './components/citation/CitMFD.jsx';
+import CitDuo from './components/citation/CitDuo.jsx';
 import CitEICAS from './components/citation/CitEICAS.jsx';
 import CitAP from './components/citation/CitAP.jsx';
 import CitRMU from './components/citation/CitRMU.jsx';
@@ -29,6 +30,7 @@ const ICONS = {
   audio: 'M11 4a6 6 0 00-6 6v5M17 15v-5a6 6 0 00-6-6M4 14h2.5v4.5H4zM15.5 14H18v4.5h-2.5z',
   eicas: 'M5 4v14M9 4v14M5 11h4M13 7h5M13 11h5M13 15h5',
   rmu: 'M4 5h14v12H4zM7 8h8M7 11h8M7 14h4',
+  duo: 'M3 5h7v12H3zM12 5h7v12h-7z',
 };
 function Icon({ name }) {
   return (
@@ -54,9 +56,9 @@ const PROFILES = {
   citation: {
     label: 'Cessna Citation X', short: 'CITATION X',
     tabs: [
-      { id: 'pfd', label: 'PFD' }, { id: 'mfd', label: 'MFD' }, { id: 'eicas', label: 'EICAS' },
-      { id: 'fms', label: 'CDU/FMS' }, { id: 'ap', label: 'Autopilot' }, { id: 'rmu', label: 'Radios' },
-      { id: 'map', label: 'Map' },
+      { id: 'duo', label: 'PFD+MFD' }, { id: 'pfd', label: 'PFD' }, { id: 'mfd', label: 'MFD' },
+      { id: 'eicas', label: 'EICAS' }, { id: 'fms', label: 'CDU/FMS' }, { id: 'ap', label: 'Autopilot' },
+      { id: 'rmu', label: 'Radios' }, { id: 'map', label: 'Map' },
     ],
   },
   ga: {
@@ -234,6 +236,7 @@ export default function App() {
         )}
 
         {/* ---- Cessna Citation X suite (Honeywell Primus 2000) ---- */}
+        {profile === 'citation' && tab === 'duo' && <CitDuo xp={xp} />}
         {profile === 'citation' && tab === 'pfd' && <CitPFD xp={xp} />}
         {profile === 'citation' && tab === 'mfd' && <CitMFD xp={xp} />}
         {profile === 'citation' && tab === 'eicas' && <CitEICAS xp={xp} />}