feat: Gezeiten im Logbuch per Open-Meteo Marine

HW/NW-Felder im Reisetag und Live-Journal mit Server-Proxy auf Basis von
Open-Meteo Marine am GPS-Standort; neueste Position und frischer DB-Stand
vor dem Abruf, Bestätigung nach Übernehmen, Accordion-Layout bereinigt.

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

client/src/utils/tideTurtle.ts

@@ -0,0 +1,108 @@
+export interface TideExtreme {
+  time: string
+  date: string
+  height: number
+  isHigh: boolean
+}
+
+export interface ParsedTideTimes {
+  highWater: string
+  lowWater: string
+  placeName?: string
+  distanceKm?: number
+  timezone: string
+}
+
+function isoToHHMM(iso: string, timeZone: string): string {
+  const d = new Date(iso)
+  if (Number.isNaN(d.getTime())) return ''
+  const parts = new Intl.DateTimeFormat('en-GB', {
+    timeZone,
+    hour: '2-digit',
+    minute: '2-digit',
+    hour12: false
+  }).formatToParts(d)
+  const hour = parts.find((p) => p.type === 'hour')?.value ?? '00'
+  const minute = parts.find((p) => p.type === 'minute')?.value ?? '00'
+  return `${hour}:${minute}`
+}
+
+function asRecord(value: unknown): Record<string, unknown> | null {
+  return value && typeof value === 'object' && !Array.isArray(value)
+    ? (value as Record<string, unknown>)
+    : null
+}
+
+function readExtrema(data: Record<string, unknown>): TideExtreme[] {
+  const raw = data.extrema
+  if (!Array.isArray(raw)) return []
+  const out: TideExtreme[] = []
+  for (const item of raw) {
+    const row = asRecord(item)
+    if (!row) continue
+    const time = String(row.time ?? '').trim()
+    const date = String(row.date ?? '').trim()
+    if (!time || !date) continue
+    out.push({
+      time,
+      date,
+      height: Number(row.height ?? 0),
+      isHigh: row.isHigh === true || row.type === 'high'
+    })
+  }
+  return out
+}
+
+/** Normalize TideTurtle nearby or place JSON into extrema + metadata. */
+export function extractTideTurtlePayload(data: Record<string, unknown>): {
+  extrema: TideExtreme[]
+  timezone: string
+  placeName?: string
+  distanceKm?: number
+} {
+  const place = asRecord(data.place)
+  const location = asRecord(data.location)
+  const tidesRoot = asRecord(data.tides) ?? data
+  const tidesData = asRecord(tidesRoot.data) ?? tidesRoot
+  const spatial = asRecord(tidesData.spatialCoverage) ?? asRecord(data.spatialCoverage)
+
+  const timezone = String(tidesData.timezone ?? 'UTC')
+  const extrema = readExtrema(tidesData)
+
+  let placeName = place?.name ? String(place.name) : undefined
+  if (!placeName && location?.name) placeName = String(location.name)
+  if (!placeName && spatial?.name) placeName = String(spatial.name)
+
+  const distanceKm =
+    location?.source === 'coordinates'
+      ? undefined
+      : data.distanceKm != null && data.distanceKm !== ''
+        ? Number(data.distanceKm)
+        : undefined
+
+  return { extrema, timezone, placeName, distanceKm }
+}
+
+/** First high and first low tide on entryDate (YYYY-MM-DD). */
+export function parseTideTurtleForDate(
+  data: Record<string, unknown>,
+  entryDate: string
+): ParsedTideTimes {
+  const { extrema, timezone, placeName, distanceKm } = extractTideTurtlePayload(data)
+
+  let highWater = ''
+  let lowWater = ''
+
+  for (const extreme of extrema) {
+    if (extreme.date !== entryDate) continue
+    if (extreme.isHigh && !highWater) {
+      highWater = isoToHHMM(extreme.time, timezone)
+    }
+    if (!extreme.isHigh && !lowWater) {
+      lowWater = isoToHHMM(extreme.time, timezone)
+    }
+    if (highWater && lowWater) break
+  }
+
+  return { highWater, lowWater, placeName, distanceKm, timezone }
+}