fix: Pi trip builder drops GPS lock-in drift trips (BUG-23)

Add the server's minimum-trip filter to build_trip_summaries() — duration
< 30s OR distance < 0.05km is rejected — so GPS lock-in drift no longer
spawns false trips on the Pi. Also sort normalized rows by datetime (the
server already orders by recorded_at ASC), fixing clock-rollback trip
boundaries. Bump TRIP_BUILD_VERSION to force a Pi-side rebuild.

modules/app_sql.py

@@ -25,7 +25,7 @@ IDLE_LOG_INTERVAL = 60
 GPS_LOG_DISTANCE_METERS = 8
 TRIP_REFRESH_INTERVAL = 30
 TRIP_REBUILD_OVERLAP_ROWS = 120
-TRIP_BUILD_VERSION = 3
+TRIP_BUILD_VERSION = 4
 
 _conn = None
 _conn_lock = Lock()