feat(hunt): track walking distance via GPS, show live locations on map

Add foreground-only GPS distance tracking for hunts

app/stores/settings.ts

@@ -3,8 +3,25 @@ export const useSettingsStore = defineStore(
   () => {
     const hideAnswers = ref(true);
     const isSidebarVisible = ref(false);
+    // Per-hunt, client-only consent for GPS distance tracking. Off by default;
+    // the server cannot prove consent, so this lives only in the client store.
+    const trackConsent = ref<Record<number, boolean>>({});
 
-    return { hideAnswers, isSidebarVisible };
+    function hasTrackConsent(huntId: number): boolean {
+      return trackConsent.value[huntId] ?? false;
+    }
+
+    function setTrackConsent(huntId: number, consent: boolean) {
+      trackConsent.value[huntId] = consent;
+    }
+
+    return {
+      hideAnswers,
+      isSidebarVisible,
+      trackConsent,
+      hasTrackConsent,
+      setTrackConsent
+    };
   },
   { persist: true }
 );