Remove mock seed drivers and dead marker scatter

The drivers table was seeded with 4 fake fixtures (Karim/Rana/Omar/Layal)
using randomuser.me/unsplash placeholder images. They had no user_id, no
position, and were excluded from matching and the rider map by design, so
they only ever cluttered the dashboard. The table now starts empty — real
drivers are created in-app via onboarding (driver/profile POST), which
links a row to a real user account and gives it a live GPS position.

Dropped the dead random-offset scatter in generateMarkersFromData that
fabricated fake driver positions for drivers without GPS. It was already
unreachable (the null-position filter excluded those drivers), so this is
stub cleanup, not a behavior change — drivers without a real position
simply aren't rendered.

The 4 fixture rows were also removed from the live Neon DB (user_id IS
NULL); real onboarded drivers were untouched.

Co-Authored-By: Claude <noreply@anthropic.com>

lib/map.ts

@@ -4,13 +4,11 @@ import type { Driver, MarkerData } from "@/types/type";
 
 const directionsAPI = process.env.EXPO_PUBLIC_GOOGLE_API_KEY;
 
-// Build map markers from driver rows. Drivers with a real GPS position use it
-// directly; only legacy seed rows (no position) fall back to a small random
-// scatter around the rider so the map isn't empty during local dev.
+// Build map markers from driver rows. Only drivers reporting a real GPS
+// position are shown — there is no fallback/scatter, so drivers without a
+// position (none, now that seed fixtures are gone) simply aren't rendered.
 export const generateMarkersFromData = ({
   data,
-  userLatitude,
-  userLongitude,
 }: {
   data: Driver[];
   userLatitude: number;
@@ -18,23 +16,12 @@ export const generateMarkersFromData = ({
 }): MarkerData[] => {
   return data
     .filter((driver) => driver.latitude != null && driver.longitude != null)
-    .map((driver) => {
-      const lat =
-        driver.latitude != null
-          ? driver.latitude
-          : userLatitude + (Math.random() - 0.5) * 0.01;
-      const lng =
-        driver.longitude != null
-          ? driver.longitude
-          : userLongitude + (Math.random() - 0.5) * 0.01;
-
-      return {
-        ...driver,
-        latitude: lat,
-        longitude: lng,
-        title: `${driver.first_name} ${driver.last_name}`,
-      };
-    });
+    .map((driver) => ({
+      ...driver,
+      latitude: driver.latitude as number,
+      longitude: driver.longitude as number,
+      title: `${driver.first_name} ${driver.last_name}`,
+    }));
 };
 
 export const calculateRegion = ({