G1000: two-way sim sync, more PFD/MFD fidelity, authentic dialogs

Sync (FlyWithLua companions in plugins/ + server/fmssync.js):
- FMS flight-plan two-way sync (App <-> in-sim FMS) via fms-sync.lua
- G1000 UI-state publish (page/range/inset) via ui-sync.lua + CDI source,
  baro, map-range follow
- Terrain awareness: elevation grid probe (terrain-probe.lua) -> red/yellow
  MFD overlay vs aircraft altitude

PFD:
- AFCS mode annunciation bar from autopilot _status datarefs
- CDI source GPS/VLOC colouring, BRG1/BRG2 pointers + DME windows, marker beacons
- magenta speed/altitude trend vectors, selected-altitude alerting
- time-based (frame-rate-independent) smoothing for attitude/heading/tapes

MFD:
- nav data bar (DTK/ETE/active leg), airways overlay from earth_awy.dat,
  compass rose anchored to the ownship

Dialogs (NEAREST/FLIGHTPLAN/DIRECT-TO/PROCEDURES):
- flat, square, embedded G1000 look (no shadow/rounded/transparency)
- compact lower-right placement, no close X (softkey toggles), single window
- NEAREST 2-line entries (ILS/VFR, COM freq, runway length), PROC action menu

Service worker: network-first HTML so reloads pick up new builds (cache v2).

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

server/flightplan.js

@@ -87,14 +87,51 @@ export function exportFms(name = 'WEBFPL') {
   }
   const content = lines.join('\n') + '\n';
 
-  const root = xplaneRoot();
-  const dir = root ? path.join(root, 'Output', 'FMS plans') : path.join(process.cwd(), 'fms-out');
+  const dir = fmsDir();
   try {
     fs.mkdirSync(dir, { recursive: true });
     const file = path.join(dir, `${name}.fms`);
     fs.writeFileSync(file, content);
-    return { ok: true, file, intoXplane: !!root };
+    return { ok: true, file, intoXplane: !!xplaneRoot() };
   } catch (e) {
     return { ok: false, error: e.message };
   }
 }
+
+// ---- load saved X-Plane .fms plans (Output/FMS plans) ----
+function fmsDir() {
+  const root = xplaneRoot();
+  return root ? path.join(root, 'Output', 'FMS plans') : path.join(process.cwd(), 'fms-out');
+}
+const FMS_TYPE = { 1: 'APT', 2: 'NDB', 3: 'VOR', 11: 'WPT', 28: 'USR' };
+
+// List the names of every saved .fms plan (X-Plane's own + our exports).
+export function listPlans() {
+  try {
+    return fs.readdirSync(fmsDir())
+      .filter((f) => f.toLowerCase().endsWith('.fms'))
+      .map((f) => f.replace(/\.fms$/i, ''))
+      .sort((a, b) => a.localeCompare(b));
+  } catch { return []; }
+}
+
+// Parse a saved .fms (v1100/v3) into our waypoints and make it the active plan.
+export function loadFms(name) {
+  const safe = String(name || '').replace(/[^\w .+-]/g, '');
+  const file = path.join(fmsDir(), `${safe}.fms`);
+  if (!fs.existsSync(file)) return { ok: false, error: `not found: ${safe}` };
+  const wps = [];
+  for (const raw of fs.readFileSync(file, 'utf8').split(/\r?\n/)) {
+    const p = raw.trim().split(/\s+/);
+    // waypoint rows start with a numeric type code: <type> <ident> <alt> <lat> <lon>
+    if (p.length >= 5 && /^\d+$/.test(p[0]) && p[0] !== '1100') {
+      const lat = parseFloat(p[3]), lon = parseFloat(p[4]), alt = parseFloat(p[2]);
+      if (isFinite(lat) && isFinite(lon)) {
+        wps.push({ id: p[1], lat, lon, type: FMS_TYPE[+p[0]] || 'WPT', alt: alt > 0 ? Math.round(alt) : null });
+      }
+    }
+  }
+  if (wps.length < 1) return { ok: false, error: 'no waypoints in file' };
+  setPlan({ name: safe.toUpperCase(), waypoints: wps, activeLeg: 1 });
+  return { ok: true, plan, count: wps.length };
+}