Implement CSV fetching utility across components for improved data handling

This commit introduces a new utility function, fetchCsvText, to streamline the fetching of CSV data across multiple components. The function includes a cache-busting mechanism and retry logic to enhance reliability when retrieving data from the server. This change improves error handling and ensures consistent data retrieval in the Mannschaften overview, detail, and schedule pages, contributing to a more robust application.

pages/mannschaften/[slug].vue

@@ -140,12 +140,26 @@ import { Users } from 'lucide-vue-next'
 const route = useRoute()
 const mannschaft = ref(null)
 
+async function fetchCsvText(url) {
+  const attempt = async () => {
+    const withBuster = `${url}${url.includes('?') ? '&' : '?'}_t=${Date.now()}`
+    const res = await fetch(withBuster, { cache: 'no-store' })
+    if (!res.ok) return null
+    return await res.text()
+  }
+
+  try {
+    return await attempt()
+  } catch (_e) {
+    await new Promise(resolve => setTimeout(resolve, 150))
+    return await attempt()
+  }
+}
+
 const loadMannschaften = async () => {
   try {
-    const response = await fetch('/data/mannschaften.csv')
-    if (!response.ok) return
-    
-    const csv = await response.text()
+    const csv = await fetchCsvText('/data/mannschaften.csv')
+    if (!csv) return
     const lines = csv.split('\n').filter(line => line.trim() !== '')
     
     if (lines.length < 2) return