Auto-install Lua, smooth all panels, airspace overlay + launcher region picker

FlyWithLua auto-install: bridge drops fms-sync/ui-sync/terrain-probe into
X-Plane's FlyWithLua Scripts dir on startup and self-updates (content-compare).
Graceful when no X-Plane / no FlyWithLua. /api/lua/install + status in health.
Desktop app bundles the scripts and passes LUA_SRC_DIR to the sidecar.

Smoothing: shared useEased/useEasedAngle hook (api/ease.js) with render-bail on
settle. VFR steam gauges now interpolate to 60fps instead of stepping at the
~10Hz value stream. MFD ownship no longer vibrates — position/heading eased in a
single rAF loop, follow-pan without animated-panTo pile-up (pauses on range zoom).

Airspace overlay: server/airspace.js loads per-region GeoJSON, classifies
(B/C/D/TMA/CTR/MOA/Restricted/Prohibited/Danger), bbox query, and downloads
regions on demand — FAA (US, key-free) and OpenAIP (Europe, user key). New
AIRSPACE softkey draws chart-coloured boundaries (B blue, C magenta, D dashed),
non-interactive so map-clicks still drop waypoints. Launcher gains a "Lufträume"
section to pick/download regions via the running bridge.

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

server/bridge.js

@@ -11,10 +11,12 @@ import http from 'node:http';
 import path from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { CONFIG, DATAREFS, WRITABLE_DATAREFS, COMMANDS } from './config.js';
-import { loadNavData, search as navSearch, navStatus, nearest as navNearest, bbox as navBbox, runwaysNear as navRunways, airwaysBbox as navAirways } from './navdata.js';
+import { loadNavData, search as navSearch, navStatus, nearest as navNearest, bbox as navBbox, runwaysNear as navRunways, airwaysBbox as navAirways, xplaneRoot } from './navdata.js';
 import { parseProcedures, procedureLegs as procLegs } from './procedures.js';
 import * as fp from './flightplan.js';
 import { pushToSim, startFmsSync, startTerrainSync } from './fmssync.js';
+import { installLuaScripts } from './luainstall.js';
+import { loadAirspace, airspaceBbox, airspaceStatus, regionList, installRegion } from './airspace.js';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 // WEB_DIST can be overridden (e.g. the desktop app points it at the cockpit
@@ -34,6 +36,7 @@ const state = {
   cmdNameToId: new Map(),     // sim/... -> id
   xpSocket: null,
   reqId: 1,
+  lua: null,                  // last FlyWithLua-install report (see luainstall.js)
 };
 
 const clients = new Set(); // connected browser sockets
@@ -211,8 +214,14 @@ const app = express();
 // by design, so a wildcard here is harmless and keeps tablets/the app simple.
 app.use('/api', (_req, res, next) => { res.set('Access-Control-Allow-Origin', '*'); next(); });
 app.get('/api/health', (_req, res) =>
-  res.json({ xpConnected: state.xpConnected, datarefs: state.drefIdToAlias.size, clients: clients.size, nav: navStatus() })
+  res.json({ xpConnected: state.xpConnected, datarefs: state.drefIdToAlias.size, clients: clients.size, nav: navStatus(), lua: state.lua })
 );
+// Re-run the FlyWithLua companion install on demand (e.g. after installing
+// FlyWithLua, or to push a freshly edited script without restarting the bridge).
+app.post('/api/lua/install', (_req, res) => {
+  state.lua = installLuaScripts(xplaneRoot(), log);
+  res.json(state.lua);
+});
 // Waypoint / navaid / airport search from X-Plane's own nav database.
 app.get('/api/nav/search', (req, res) => res.json(navSearch(req.query.q || '', 25)));
 // NEAREST airports/navaids to a point (NRST page).
@@ -228,6 +237,19 @@ app.get('/api/nav/bbox', (req, res) =>
 app.get('/api/nav/airways', (req, res) =>
   res.json(navAirways(+req.query.s, +req.query.w, +req.query.n, +req.query.e, +req.query.limit || 500))
 );
+// Airspace polygons inside a map window — for the MFD AIRSPACE overlay. Data
+// comes from region GeoJSON files the user installs via the launcher (X-Plane
+// ships none). See server/airspace.js.
+app.get('/api/airspace/bbox', (req, res) =>
+  res.json(airspaceBbox(+req.query.s, +req.query.w, +req.query.n, +req.query.e, +req.query.limit || 400))
+);
+// Available airspace regions + how many features of each are installed.
+app.get('/api/airspace/regions', (_req, res) => res.json({ regions: regionList(), status: airspaceStatus() }));
+// Download + install a region's airspace (FAA US is key-free; OpenAIP needs key).
+app.post('/api/airspace/install', express.json(), async (req, res) => {
+  const r = await installRegion(req.body?.region, { apiKey: req.body?.apiKey, log });
+  res.json(r);
+});
 // Runways near a point — drawn in the PFD synthetic-vision view.
 app.get('/api/nav/runways', (req, res) =>
   res.json(navRunways(+req.query.lat, +req.query.lon, +req.query.radius || 12))
@@ -342,7 +364,11 @@ function startDemo() {
 server.listen(CONFIG.bridgePort, CONFIG.bridgeHost, () => {
   log(`Bridge UI:  http://${CONFIG.bridgeHost}:${CONFIG.bridgePort}`);
   log(`On tablets: http://<this-PC-LAN-IP>:${CONFIG.bridgePort}`);
-  loadNavData(); // async; FMS resolves idents once ready
+  loadNavData(); // async; FMS resolves idents once ready (sets root synchronously)
+  // Drop the FlyWithLua companion scripts into the sim so the user never copies
+  // files by hand; keeps the installed copies up to date on every start.
+  state.lua = installLuaScripts(xplaneRoot(), log);
+  loadAirspace(log); // installed region GeoJSON → /api/airspace/bbox overlay
   // FMS two-way sync (Sim → App): adopt plans built/edited in the real G1000
   startFmsSync({
     getPlan: () => fp.getPlan(),