Fix JWT signing for Google Calendar authentication

- Change from jwt.sign() to SignJWT class
- Use proper jose library SignJWT API for Deno
- Fix 'Cannot read properties of undefined' error

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

supabase/functions/create-google-meet-event/index.ts

@@ -30,33 +30,21 @@ interface CreateMeetRequest {
 // Function to create JWT and get access token
 async function getGoogleAccessToken(serviceAccount: GoogleServiceAccount): Promise<string> {
   try {
-    // Import JWT library
-    const { jwt } = await import("https://deno.land/x/jose@v4.15.1/index.ts");
-
-    // Create JWT header and payload
-    const header = {
-      alg: "RS256",
-      typ: "JWT",
-      kid: serviceAccount.private_key_id,
-    };
+    // Import JWT sign function from jose
+    const { SignJWT } = await import("https://deno.land/x/jose@v4.15.1/index.ts");
 
     const now = Math.floor(Date.now() / 1000);
-    const payload = {
+
+    // Create and sign JWT
+    const token = await new SignJWT({
       iss: serviceAccount.client_email,
       scope: "https://www.googleapis.com/auth/calendar",
       aud: serviceAccount.token_uri,
       exp: now + 3600,
       iat: now,
-    };
-
-    // Import key
-    const privateKey = serviceAccount.private_key;
-
-    // Sign JWT
-    const token = await jwt.sign(payload, privateKey, {
-      algorithm: 'RS256',
-      header: header,
-    });
+    })
+      .setProtectedHeader({ alg: 'RS256', kid: serviceAccount.private_key_id })
+      .sign(serviceAccount.private_key);
 
     // Exchange JWT for access token
     const response = await fetch(serviceAccount.token_uri, {