fix: correct WebDAV URL and auto-create weegschaal directory on sync

src/sync/syncService.ts

@@ -42,13 +42,32 @@ async function fetchRemote(config: { url: string; username: string; password: st
   return response.json()
 }
 
+async function createDir(config: { url: string; username: string; password: string }): Promise<void> {
+  const base = config.url.replace(/\/+$/, '')
+  const dirUrl = `${base}/weegschaal`
+
+  const response = await fetch(dirUrl, {
+    method: 'MKCOL',
+    headers: {
+      Authorization: 'Basic ' + btoa(`${config.username}:${config.password}`),
+    },
+  })
+
+  if (response.status !== 201 && response.status !== 405) {
+    throw new Error(`WebDAV directory create failed: ${response.status}`)
+  }
+}
+
 async function uploadRemote(
   config: { url: string; username: string; password: string },
   measurements: Measurement[]
 ): Promise<void> {
-  const url = `${config.url.replace(/\/+$/, '')}/${WEBDAV_PATH}`
+  const base = config.url.replace(/\/+$/, '')
+  const url = `${base}/${WEBDAV_PATH}`
   const body = JSON.stringify(measurements)
 
+  await createDir(config)
+
   const response = await fetch(url, {
     method: 'PUT',
     headers: {