Accept Google Sheets URL in wizard and extract spreadsheet ID

lib/onboarding.js

@@ -78,6 +78,33 @@ async function askOptionalPositiveInteger(ask, question, defaultValue) {
   }
 }
 
+function extractSpreadsheetId(input) {
+  const value = (input || '').trim();
+  if (!value) {
+    return '';
+  }
+
+  const urlMatch = value.match(/\/spreadsheets\/d\/([a-zA-Z0-9-_]+)/i);
+  if (urlMatch && urlMatch[1]) {
+    return urlMatch[1];
+  }
+
+  return value;
+}
+
+async function askSpreadsheetIdOrUrl(ask, question) {
+  while (true) {
+    const answer = await ask(question);
+    const documentId = extractSpreadsheetId(answer);
+
+    if (documentId) {
+      return documentId;
+    }
+
+    console.log('Please enter a Google Sheets URL or spreadsheet ID.');
+  }
+}
+
 async function pauseForEnter(ask) {
   await ask('Press Enter to close this window...');
 }
@@ -176,7 +203,10 @@ async function runOnboarding() {
     const documentCount = await askPositiveInteger(ask, 'How many documents do you want to pull from? ');
 
     for (let documentIndex = 0; documentIndex < documentCount; documentIndex += 1) {
-      const documentId = await askNonEmpty(ask, `Enter document ID ${documentIndex + 1}: `);
+      const documentId = await askSpreadsheetIdOrUrl(
+        ask,
+        `Enter Google Sheets URL or document ID ${documentIndex + 1}: `
+      );
       let documentTitle = documentId;
 
       try {