Add flight mode and GPS fix type to drone status menu

MSP_RAW_GPS already reports a fixType byte (0=no fix, 1=2D, 2=3D) but
only a collapsed hasFix bool was surfaced past the parser. Thread
fixType through TelemetryFrame and show it as a color-coded field in
the status grid, alongside the already-parsed but previously unshown
flight mode string. Arming/Temperatures/Flight mode is now a 3-column
row, and GPS fix type/GPS satellites/GPS precision (HDOP) another.

app/lib/transport/flight_controller_link.dart

@@ -29,6 +29,7 @@ class TelemetryFrame {
     required this.lat,
     required this.lon,
     required this.hasFix,
+    required this.fixType,
     required this.numSat,
     required this.altitudeM,
     required this.gpsAltitudeM,
@@ -54,6 +55,13 @@ class TelemetryFrame {
   final double lat;
   final double lon;
   final bool hasFix;
+
+  /// Roher `gpsFixType_e`-Wert aus `MSP_RAW_GPS` (`MspGpsReading.fixType` in
+  /// msp_telemetry_codec.dart): 0 = kein Fix, 1 = 2D, 2 = 3D. [hasFix] ist
+  /// bereits daraus abgeleitet (`fixType != 0`) - dieses Feld existiert nur
+  /// fuer die 2D/3D-Unterscheidung selbst (Doku: "GPS Fixtyp im Drone Status
+  /// Menue anzeigen").
+  final int fixType;
   final int numSat;
 
   /// Barometrisch/GPS-fusionierte Hoehe relativ zum Referenzpunkt der