Render a driver's location trail on the map and add controls to toggle it. Changes include: component imports (Polyline, Route), new trail state and interval ref, fetchTrail logic (uses isAuthenticated/getCurrentUser/getDriverTrail) with periodic refresh (every minute), FitTrail component to fit map to the trail, Polyline and start marker rendering, and a Trail toggle button in the UI. Also cleaned up MapBounds (explicit return null), small popup/legend adjustments, and grouped supplier processing remains unchanged. Added getDriverTrail helper in lib/pocketbase.ts to fetch today's driver_locations for a given driver id.
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