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>

scripts/prep-desktop.sh

@@ -15,6 +15,11 @@ rm -rf desktop/src-tauri/resources/web
 mkdir -p desktop/src-tauri/resources/web
 cp -R web/dist/. desktop/src-tauri/resources/web/
 
+echo "==> copying FlyWithLua companion scripts into desktop resources"
+rm -rf desktop/src-tauri/resources/plugins
+mkdir -p desktop/src-tauri/resources/plugins
+cp plugins/*.lua desktop/src-tauri/resources/plugins/
+
 echo "==> compiling bridge sidecars (Bun)"
 mkdir -p desktop/src-tauri/binaries
 bun build --compile --target=bun-darwin-arm64 server/bridge.js \