fix: 8 button-state bugs + wire radar position into replay for map display

State machine fixes:
1. Raw IQ replay EOF now calls _stop_radar() to fully restore UI
2. Worker thread finished signal triggers UI recovery on crash/exit
3. _stop_radar() stops demo simulator to prevent cross-mode interference
4. _stop_demo() correctly identifies Mock mode via combo text
5. Demo start no longer clobbers status bar when acquisition is running
6. _stop_radar() resets playback button text, frame counter, file label
7. _start_raw_iq_replay() error path cleans up stale controller/worker
8. _refresh_gui() preserves Raw IQ paused status instead of overwriting

Map/location:
- RawIQReplayWorker now receives _radar_position (GPSData ref) so
  targets get real lat/lon projected from the virtual radar position
- Added heading control to Map tab sidebar (0-360 deg, wrapping)
- Manual lat/lon/heading changes in Map tab apply to replay targets

Ruff clean, 120/120 tests pass.

9_Firmware/9_3_GUI/v7/workers.py

@@ -272,6 +272,7 @@ class RawIQReplayWorker(QThread):
         processor: RawIQFrameProcessor,
         host_processor: RadarProcessor | None = None,
         settings: RadarSettings | None = None,
+        gps_data_ref: GPSData | None = None,
         parent=None,
     ):
         super().__init__(parent)
@@ -279,6 +280,7 @@ class RawIQReplayWorker(QThread):
         self._processor = processor
         self._host_processor = host_processor
         self._settings = settings or RadarSettings()
+        self._gps = gps_data_ref
         self._running = False
         self._frame_count = 0
         self._error_count = 0
@@ -358,6 +360,7 @@ class RawIQReplayWorker(QThread):
             frame,
             self._settings.range_resolution,
             self._settings.velocity_resolution,
+            gps=self._gps,
         )
 
         # Clustering + tracking