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/config.js

@@ -60,6 +60,25 @@ export const DATAREFS = {
   hsiToFrom:   'sim/cockpit2/radios/indicators/hsi_flag_from_to_pilot',
   navBearing:  'sim/cockpit2/radios/indicators/hsi_bearing_deg_mag_pilot',
 
+  // --- bearing pointers (BRG1/BRG2) + DME + marker beacons ---
+  nav1Brg:     'sim/cockpit2/radios/indicators/nav1_bearing_deg_mag',
+  nav2Brg:     'sim/cockpit2/radios/indicators/nav2_bearing_deg_mag',
+  nav1Dme:     'sim/cockpit2/radios/indicators/nav1_dme_distance_nm',
+  nav2Dme:     'sim/cockpit2/radios/indicators/nav2_dme_distance_nm',
+  mkrOuter:    'sim/cockpit2/radios/indicators/outer_marker_lit',
+  mkrMiddle:   'sim/cockpit2/radios/indicators/middle_marker_lit',
+  mkrInner:    'sim/cockpit2/radios/indicators/inner_marker_lit',
+
+  // --- G1000 UI state (for display sync with the in-sim G1000) ---
+  // CDI/HSI source: 0 = NAV1/VLOC1, 1 = NAV2/VLOC2, 2 = GPS (standard dataref).
+  cdiSrc:      'sim/cockpit2/radios/actuators/HSI_source_select_pilot',
+  // The rest are G1000-internal, so the FlyWithLua companion (ui-sync.lua)
+  // publishes them as custom datarefs. Absent until the plugin runs -> the web
+  // G1000 just keeps its own local UI state (graceful).
+  uiMfdPage:   'glasscockpit/ui/mfd_page',     // 0 map, 1 fpl, 2 nrst
+  uiMapRange:  'glasscockpit/ui/map_range_nm', // active map range, NM
+  uiInset:     'glasscockpit/ui/inset',        // PFD inset map on/off (0/1)
+
   // --- G1000 PFD: data fields ---
   baro:        'sim/cockpit2/gauges/actuators/barometer_setting_in_hg_pilot',
   tas:         'sim/cockpit2/gauges/indicators/true_airspeed_kts_pilot',
@@ -88,6 +107,21 @@ export const DATAREFS = {
   apSpdBug:    'sim/cockpit2/autopilot/airspeed_dial_kts_mach',
   apEngaged:   'sim/cockpit2/autopilot/servos_on',
   navHdef:     'sim/cockpit2/radios/indicators/hsi_relative_bearing_vor_pilot',
+
+  // --- AFCS mode annunciation (the green/white mode strip on a real G1000) ---
+  // X-Plane's per-mode status datarefs: 0 = off, 1 = armed, 2 = active/captured.
+  // These mean the AFCS bar mirrors the sim exactly, no Lua needed.
+  apMode:      'sim/cockpit2/autopilot/autopilot_mode',       // 0 off, 1 FD, 2 AP
+  hdgStatus:   'sim/cockpit2/autopilot/hdg_status',
+  navStatus:   'sim/cockpit2/autopilot/nav_status',
+  gpssStatus:  'sim/cockpit2/autopilot/gpss_status',
+  aprStatus:   'sim/cockpit2/autopilot/approach_status',
+  bcStatus:    'sim/cockpit2/autopilot/backcourse_status',
+  altStatus:   'sim/cockpit2/autopilot/alt_hold_status',
+  vsStatus:    'sim/cockpit2/autopilot/vvi_status',
+  flcStatus:   'sim/cockpit2/autopilot/speed_status',
+  gsStatus:    'sim/cockpit2/autopilot/glideslope_status',
+  vnavStatus:  'sim/cockpit2/autopilot/vnav_status',
 };
 
 // Datarefs the frontend may WRITE (e.g. turning the heading bug knob).
@@ -121,6 +155,17 @@ export const COMMANDS = {
   xpdrIdent: 'sim/transponder/transponder_ident',
 };
 
+// Per-radio standby tuning (coarse = MHz, fine = kHz) + active/standby flip.
+// These work regardless of the dataref's frequency units, so the web tuner just
+// fires them — no risky raw frequency writes.
+for (const r of ['nav1', 'nav2', 'com1', 'com2']) {
+  COMMANDS[`${r}CoarseUp`] = `sim/radios/stby_${r}_coarse_up`;
+  COMMANDS[`${r}CoarseDown`] = `sim/radios/stby_${r}_coarse_down`;
+  COMMANDS[`${r}FineUp`] = `sim/radios/stby_${r}_fine_up`;
+  COMMANDS[`${r}FineDown`] = `sim/radios/stby_${r}_fine_down`;
+  COMMANDS[`${r}Swap`] = `sim/radios/${r}_standby_flip`;
+}
+
 // Every clickable G1000 bezel control maps to a real X-Plane command. The PFD
 // is unit n1, the MFD is unit n3 (the default C172 layout). Aliases are
 // prefixed pfd_/mfd_ so the frontend just says e.g. command('mfd_fpl').