feat: extract vocabulary name for issue title

Author: ensan-hcl

.github/workflows/google_form.yaml

@@ -19,7 +19,15 @@ jobs:
         with:
           script: |
             const payload = context.payload.client_payload;
-            const title = `Form response – ${payload.filename}`;
+            // Extract the word after "単語を入力してください:" if present
+            const wordMatch = payload.content.match(/^単語を入力してください:\s*(.+)$/m);
+            const word = wordMatch ? wordMatch[1].trim() : null;
+
+            const titlePrefix = word
+              ? `vocabulary: add 「${word}」`
+              : 'Form response';
+            const title = `${titlePrefix} (${payload.filename})`;
+
             const body = [
               'Google Formに辞書追加のリクエストがありました。対応を検討してください。',
               '',