fix(tides): fix stale locations in frontend and implement digraph fallback & direct BSH matching on server

server/src/utils/tideProvider.ts

@@ -2,6 +2,7 @@ import {
   fetchBshTidesForCoordinates,
   fetchBshTidesForStation,
   listNearbyBshStations,
+  loadBshStationIndex,
   MAX_BSH_DISTANCE_KM,
   type BshStationSuggestion
 } from './bshTides.js'
@@ -77,9 +78,52 @@ export async function fetchTidesForStation(
   }
 }
 
+function normalizeForMatching(s: string): string {
+  return s
+    .toLowerCase()
+    .trim()
+    .replace(/ae/g, 'ä')
+    .replace(/oe/g, 'ö')
+    .replace(/ue/g, 'ü')
+    .replace(/ss/g, 'ß');
+}
+
 export async function fetchTidesForPlace(query: string): Promise<TideProviderResult> {
+  const normQuery = normalizeForMatching(query)
+  if (normQuery) {
+    try {
+      const stations = await loadBshStationIndex()
+      let match = stations.find(s => normalizeForMatching(s.name) === normQuery)
+      if (!match) {
+        match = stations.find(s => normalizeForMatching(s.name).startsWith(normQuery))
+      }
+      if (match) {
+        console.log(`[tideProvider] Match found in BSH station index for "${query}": ${match.name} (${match.id})`)
+        return await fetchTidesForStation(match.id)
+      }
+    } catch (err) {
+      console.warn('[tideProvider] Direct BSH station lookup failed:', err)
+    }
+  }
+
   const place = await geocodePlace(query)
   if (!place) {
+    if (normQuery) {
+      try {
+        const stations = await loadBshStationIndex()
+        const match = stations.find(s => 
+          normalizeForMatching(s.name).includes(normQuery) || 
+          normQuery.includes(normalizeForMatching(s.name))
+        )
+        if (match) {
+          console.log(`[tideProvider] Geocoding failed. Found fallback BSH station match for "${query}": ${match.name} (${match.id})`)
+          return await fetchTidesForStation(match.id)
+        }
+      } catch (err) {
+        console.warn('[tideProvider] Fallback BSH station lookup failed:', err)
+      }
+    }
+
     const err = new Error('place_not_found') as Error & { status?: number }
     err.status = 404
     throw err