drone status pill in footer for fly mode implemented. footer layout and sizes homogenized

app/lib/transport/msp/msp_telemetry_codec.dart

@@ -11,6 +11,7 @@ class MspGpsReading {
     required this.lon,
     required this.speedMs,
     required this.headingDeg,
+    required this.hdop,
   });
 
   /// 0 = kein Fix (`fc_msp.c`: `gpsSol.fixType`).
@@ -24,6 +25,13 @@ class MspGpsReading {
   /// `groundCourse` - nur bei [hasFix] aussagekraeftig.
   final double headingDeg;
 
+  /// Horizontale Streuung der Positionsschaetzung (kleiner = besser, ~1.0
+  /// oder darunter ist gut) - `gpsSol.hdop / HDOP_SCALE` (`gps.h`:
+  /// `#define HDOP_SCALE (100)`). Ohne Fix meldet iNAV hier 9999/100 =
+  /// 99.99 (`gps.c`: `gpsSol.hdop = 9999`), also einen sehr grossen statt
+  /// eines fehlenden Werts.
+  final double hdop;
+
   bool get hasFix => fixType != 0;
 }
 
@@ -37,6 +45,7 @@ MspGpsReading parseMspRawGps(Uint8List payload) {
     lon: data.getInt32(6, Endian.little) / 1e7,
     speedMs: data.getUint16(12, Endian.little) / 100.0,
     headingDeg: data.getUint16(14, Endian.little) / 10.0,
+    hdop: data.getUint16(16, Endian.little) / 100.0,
   );
 }
 
@@ -133,3 +142,11 @@ int parseMspInavAnalogBatteryPercent(Uint8List payload) => payload[21];
 /// Empfaenger-Linkqualitaet in Prozent (Offset 1, `rxLinkStatistics.uplinkLQ`
 /// - bereits 0-100, siehe [MspCommands.inavLinkStats]).
 int parseMspLinkQuality(Uint8List payload) => payload[1];
+
+/// Parst die `MSP2_INAV_GET_LINK_STATS`-Antwort und liefert das
+/// Signal-Rausch-Verhaeltnis des Uplinks in dB (Offset 2,
+/// `rxLinkStatistics.uplinkSNR` - `int8_t`, `fc_msp.c` schreibt
+/// `(uint8_t)rxLinkStatistics.uplinkSNR`, das Byte muss also vorzeichen-
+/// behaftet zurueckgelesen werden, siehe [MspCommands.inavLinkStats]).
+int parseMspLinkStatsSnr(Uint8List payload) =>
+    ByteData.sublistView(payload).getInt8(2);

app/lib/transport/msp/msp_telemetry_poller.dart

@@ -40,6 +40,8 @@ class MspTelemetryPoller {
   int? _activeWaypointIndex;
   int _batteryPercent = 0;
   int _linkQuality = 0;
+  int _snrDb = 0;
+  int _navMode = 0;
   String _flightMode = 'Idle';
 
   Stream<TelemetryFrame> get frames => _framesController.stream;
@@ -81,13 +83,15 @@ class MspTelemetryPoller {
       );
       final navStatusPayload = await _client.request(MspCommands.navStatus);
       _activeWaypointIndex = parseMspNavStatusActiveWaypoint(navStatusPayload);
-      _flightMode = parseMspNavMode(navStatusPayload).formatted;
+      final navMode = parseMspNavMode(navStatusPayload);
+      _navMode = navMode.mode;
+      _flightMode = navMode.formatted;
       _batteryPercent = parseMspInavAnalogBatteryPercent(
         await _client.request(MspCommands.inavAnalog),
       );
-      _linkQuality = parseMspLinkQuality(
-        await _client.request(MspCommands.inavLinkStats),
-      );
+      final linkStatsPayload = await _client.request(MspCommands.inavLinkStats);
+      _linkQuality = parseMspLinkQuality(linkStatsPayload);
+      _snrDb = parseMspLinkStatsSnr(linkStatsPayload);
     }
 
     if (!_framesController.isClosed) {
@@ -102,6 +106,9 @@ class MspTelemetryPoller {
         armed: _armed,
         batteryPercent: _batteryPercent,
         linkQuality: _linkQuality,
+        snrDb: _snrDb,
+        hdop: gps.hdop,
+        navMode: _navMode,
         flightMode: _flightMode,
         activeWaypointIndex: _activeWaypointIndex,
       ));