fix: Onboarding-Tour bei gelöschtem Demo-Logbuch und GPS-Schritt stabilisieren

Bereinigt veraltete Demo-Referenzen, löst gültiges Logbuch und ersten Eintrag zur Laufzeit auf und scrollt den GPS-Track-Schritt automatisch ins Viewport.

Co-authored-by: Cursor <cursoragent@cursor.com>

client/src/services/demoLogbook.test.ts

@@ -0,0 +1,36 @@
+import { beforeEach, describe, expect, it } from 'vitest'
+import {
+  clearDemoLogbookRefs,
+  getDemoFirstEntryStorageKey,
+  getDemoLogbookStorageKey
+} from './demoLogbook.js'
+
+describe('clearDemoLogbookRefs', () => {
+  const userId = 'user-1'
+
+  beforeEach(() => {
+    localStorage.clear()
+    localStorage.setItem('active_userid', userId)
+  })
+
+  it('removes demo logbook and first-entry keys for the user', () => {
+    const logbookId = 'lb-demo'
+    localStorage.setItem(getDemoLogbookStorageKey(userId), logbookId)
+    localStorage.setItem(getDemoFirstEntryStorageKey(userId), 'entry-1')
+
+    clearDemoLogbookRefs(userId, logbookId)
+
+    expect(localStorage.getItem(getDemoLogbookStorageKey(userId))).toBeNull()
+    expect(localStorage.getItem(getDemoFirstEntryStorageKey(userId))).toBeNull()
+  })
+
+  it('does not clear refs when logbookId does not match stored demo id', () => {
+    localStorage.setItem(getDemoLogbookStorageKey(userId), 'other-logbook')
+    localStorage.setItem(getDemoFirstEntryStorageKey(userId), 'entry-1')
+
+    clearDemoLogbookRefs(userId, 'deleted-logbook')
+
+    expect(localStorage.getItem(getDemoLogbookStorageKey(userId))).toBe('other-logbook')
+    expect(localStorage.getItem(getDemoFirstEntryStorageKey(userId))).toBe('entry-1')
+  })
+})