test: align suite with shipped behavior (WiFi swap, BUG-10 guard, odometer_baseline)

- test_app_trip + test_trip_sql: mock was_car_ever_connected() so trip
  building runs (BUG-10 guard suppresses trips until car ECU reached)
- test_app_settings: include odometer_baseline in valid payload + assert save
- test_yaris_uplink: Hotspot -> Hotspot-local; restore_fallback no longer
  activates AP (reports no_connection); wait timeout writes fallback_restored
- test_app_network: local_hotspot mode removed by WiFi swap -> wifi/no-internet

tests/test_app_settings.py

@@ -18,6 +18,7 @@ def valid_payload():
         "ntfy_token": "secret-token",
         "clear_ntfy_url": False,
         "clear_ntfy_token": False,
+        "odometer_baseline": 0,
         "alert_thresholds": {
             "temperature_c": 75.5,
             "disk_percent": 88,
@@ -66,6 +67,7 @@ class SettingsUpdateTest(unittest.TestCase):
         )
         self.assertEqual(self.settings["alert_ntfy_token"], "secret-token")
         self.assertEqual(self.settings["alert_temperature_c"], "75.5")
+        self.assertEqual(self.settings["odometer_baseline"], "0.0")
 
     def test_invalid_payload_does_not_save_any_settings(self):
         payload = valid_payload()