Robust fetch with User-Agent and URL encoding

icalendar.ts

@@ -154,14 +154,32 @@ async function getSources(): Promise<Source[]> {
  * Fetches and parses events from a single calendar source
  */
 async function fetchAndParseCalendar(source: Source): Promise<CalendarEvent[]> {
-  const url = source.url.trim();
+  let url = source.url.trim();
+  
+  // Handle internal spaces which are common in copy-pasted URLs
+  if (url.includes(" ")) {
+    console.log(`[iCalendar] URL contains spaces, encoding: "${url}"`);
+    url = encodeURI(url);
+  }
+
   console.log(`[iCalendar] Fetching: ${url}`);
-  const response = await fetch(url);
+  
+  const response = await fetch(url, {
+    headers: {
+      "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36"
+    }
+  });
 
   if (!response.ok) {
-    const error = new Error(`HTTP ${response.status}: ${response.statusText}`);
-    console.error(`[iCalendar] HTTP error:`, { source, status: response.status, statusText: response.statusText });
-    throw error;
+    const body = await response.text();
+    const errorDetail = body.slice(0, 200).replace(/\n/g, " ");
+    console.error(`[iCalendar] HTTP ${response.status} Error:`, { 
+      url, 
+      status: response.status, 
+      statusText: response.statusText,
+      bodyPreview: errorDetail
+    });
+    throw new Error(`HTTP ${response.status}: ${response.statusText || 'Error'} - ${errorDetail}`);
   }
 
   const icsData = await response.text();