feat(vessel): Schiffsflotte im Profil und Logbuch-Auswahl

Benutzerweiter Vessel-Pool (E2E, Sync, Migration von Legacy-Yachts) mit
LogbookVesselSelection und LogbookVesselPicker. Profil mit Accordion
(Flotte & Crew); Demo und Onboarding-Tour inkl. profile_vessel_pool.

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

client/src/services/logbookVesselSelection.ts

@@ -0,0 +1,73 @@
+import { db } from './db.js'
+import { getActiveMasterKey } from './auth.js'
+import { getLogbookKey } from './logbookKeys.js'
+import { decryptJson, encryptJson } from './crypto.js'
+import { syncLogbook } from './sync.js'
+import type { LogbookVesselSelectionData } from '../types/vessel.js'
+import { emptyLogbookVesselSelection } from '../types/vessel.js'
+import { buildLogbookVesselSelection } from '../utils/vesselSnapshot.js'
+import type { VesselData } from '../types/vessel.js'
+import { loadVesselPoolMap } from './vesselPool.js'
+
+async function resolveLogbookKey(logbookId: string): Promise<ArrayBuffer> {
+  const key = (await getLogbookKey(logbookId)) || getActiveMasterKey()
+  if (!key) throw new Error('Encryption key not found. Please log in.')
+  return key
+}
+
+export async function loadLogbookVesselSelection(
+  logbookId: string
+): Promise<LogbookVesselSelectionData> {
+  const record = await db.logbookVesselSelections.get(logbookId)
+  if (!record) return emptyLogbookVesselSelection()
+
+  const key = await resolveLogbookKey(logbookId)
+  const data = (await decryptJson(record.encryptedData, record.iv, record.tag, key)) as
+    | LogbookVesselSelectionData
+    | null
+  if (!data) return emptyLogbookVesselSelection()
+
+  return {
+    activeVesselId: data.activeVesselId ?? null,
+    vesselSnapshot: data.vesselSnapshot ?? null
+  }
+}
+
+export async function saveLogbookVesselSelection(
+  logbookId: string,
+  selection: LogbookVesselSelectionData
+): Promise<void> {
+  const key = await resolveLogbookKey(logbookId)
+  const encrypted = await encryptJson(selection, key)
+  const now = new Date().toISOString()
+
+  await db.logbookVesselSelections.put({
+    logbookId,
+    encryptedData: encrypted.ciphertext,
+    iv: encrypted.iv,
+    tag: encrypted.tag,
+    updatedAt: now
+  })
+
+  await db.syncQueue.put({
+    action: 'update',
+    type: 'logbookVessel',
+    payloadId: logbookId,
+    logbookId,
+    data: JSON.stringify(encrypted),
+    updatedAt: now
+  })
+
+  syncLogbook(logbookId).catch((err) => console.warn('Background sync failed:', err))
+}
+
+export async function saveLogbookVesselSelectionFromId(
+  logbookId: string,
+  activeVesselId: string | null,
+  poolOverride?: Map<string, VesselData>
+): Promise<LogbookVesselSelectionData> {
+  const pool = poolOverride ?? (await loadVesselPoolMap())
+  const selection = buildLogbookVesselSelection(activeVesselId, pool)
+  await saveLogbookVesselSelection(logbookId, selection)
+  return selection
+}