Calculating the distance (#255)

* migra for distance

* adding distance calculator

* adding ability to store home address

* improve distance calculation

* calculating distance

* show distance in grid view

* upgrading dependencies

* moving to react 19

* ability to clone a job

* fixing tests

* polishing

lib/services/geocoding/distanceService.js

@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2026 by Christian Kellner.
+ * Licensed under Apache-2.0 with Commons Clause and Attribution/Naming Clause
+ */
+
+import { distanceMeters } from '../listings/distanceCalculator.js';
+import {
+  getListingsToCalculateDistance,
+  getListingsForUserToCalculateDistance,
+  updateListingDistance,
+} from '../storage/listingsStorage.js';
+import { getUserSettings } from '../storage/settingsStorage.js';
+
+/**
+ * Calculates and updates distances for listings of a specific job.
+ * Only processes listings where distance_to_destination is null.
+ *
+ * @param {string} jobId
+ * @param {string} userId
+ * @returns {void}
+ */
+export function calculateDistanceForJob(jobId, userId) {
+  const userSettings = getUserSettings(userId);
+  const homeAddress = userSettings.home_address;
+
+  if (!homeAddress || !homeAddress.coords) {
+    return;
+  }
+
+  const listings = getListingsToCalculateDistance(jobId);
+  const { lat, lng } = homeAddress.coords;
+
+  for (const listing of listings) {
+    const dist = distanceMeters(lat, lng, listing.latitude, listing.longitude);
+    updateListingDistance(listing.id, dist);
+  }
+}
+
+/**
+ * Calculates and updates distances for all active listings of a user.
+ * Usually called when the user updates their home address.
+ *
+ * @param {string} userId
+ * @returns {void}
+ */
+export function calculateDistanceForUser(userId) {
+  const userSettings = getUserSettings(userId);
+  const homeAddress = userSettings.home_address;
+
+  if (!homeAddress || !homeAddress.coords) {
+    return;
+  }
+
+  const listings = getListingsForUserToCalculateDistance(userId);
+  const { lat, lng } = homeAddress.coords;
+
+  for (const listing of listings) {
+    const dist = distanceMeters(lat, lng, listing.latitude, listing.longitude);
+    updateListingDistance(listing.id, dist);
+  }
+}