allow update for uploaded routes and implement creator id for routes

public/js/local-routes.js

@@ -19,6 +19,31 @@ globalThis.Wegwichtel = globalThis.Wegwichtel || {};
     return target;
   }
 
+  // Separate from app/route storage: ordinary cleanup must preserve this identity.
+  const CREATOR_KEY = 'wegwichtel.creator-id.v1';
+
+  function creatorId() {
+    const target = storage();
+    const existing = target.getItem(CREATOR_KEY);
+    if (existing) {
+      if (!/^[a-f0-9]{64}$/.test(existing)) throw new Error(ns.I18n.t("local.error.identity"));
+      return existing;
+    }
+    if (typeof globalThis.crypto?.getRandomValues !== 'function') {
+      throw new Error(ns.I18n.t("local.error.identity"));
+    }
+    const bytes = globalThis.crypto.getRandomValues(new Uint8Array(32));
+    const value = Array.from(bytes, byte => byte.toString(16).padStart(2, '0')).join('');
+    target.setItem(CREATOR_KEY, value);
+    return value;
+  }
+
+  function forgetCreatorId() {
+    if (globalThis.confirm?.(ns.I18n.t("local.confirm-forget-identity")) !== true) return false;
+    storage().removeItem(CREATOR_KEY);
+    return true;
+  }
+
   function routeKey(id, suffix) {
     return `${STORAGE_PREFIX}.${encodeURIComponent(String(id))}.${suffix}`;
   }
@@ -499,6 +524,7 @@ globalThis.Wegwichtel = globalThis.Wegwichtel || {};
     const inputRoute = routePackage.route || {};
     const route = {
       id,
+      creator_id: inputRoute.creator_id || creatorId(),
       name: String(inputRoute.name || ''),
       description: String(inputRoute.description || ''),
       createdAt: inputRoute.createdAt || now,
@@ -724,6 +750,8 @@ globalThis.Wegwichtel = globalThis.Wegwichtel || {};
 
   ns.LocalRoutes = Object.freeze({
     STORAGE_PREFIX,
+    creatorId,
+    forgetCreatorId,
     appendTrackPoint,
     recordedPositions,
     replaceRecordedPositions,