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>

web/public/sw.js

@@ -1,7 +1,7 @@
 // Minimal service worker: caches the app shell so the cockpit launches fast and
 // survives brief network blips. Live data (the bridge WebSocket, /api, and map
 // tiles) is never cached — only same-origin GET app assets.
-const CACHE = 'g1000-shell-v1';
+const CACHE = 'g1000-shell-v2';
 
 self.addEventListener('install', () => self.skipWaiting());
 
@@ -18,7 +18,19 @@ self.addEventListener('fetch', (e) => {
   if (e.request.method !== 'GET' || url.origin !== location.origin) return;
   if (url.pathname.startsWith('/api') || url.pathname === '/ws') return;
 
-  // Stale-while-revalidate: serve cache fast, refresh in the background.
+  // The HTML entry is NETWORK-FIRST: a reload always gets the latest build (and
+  // thus the latest hashed assets). Falls back to cache only when offline.
+  const isDoc = e.request.mode === 'navigate' || url.pathname === '/' || url.pathname.endsWith('.html');
+  if (isDoc) {
+    e.respondWith(
+      fetch(e.request)
+        .then((res) => { caches.open(CACHE).then((c) => c.put(e.request, res.clone())); return res; })
+        .catch(() => caches.match(e.request).then((c) => c || caches.match('/')))
+    );
+    return;
+  }
+
+  // Hashed assets are immutable → stale-while-revalidate (fast + self-healing).
   e.respondWith(
     caches.open(CACHE).then(async (cache) => {
       const cached = await cache.match(e.request);