fix(watcher): handle wrapped Subject lines in forwarded emails

Update the parseForwardedHeader function to correctly join wrapped Subject lines before the To: line, ensuring accurate parsing of Gmail forwarded messages. Enhance tests to validate this behavior with Tokopedia email examples.

apps/watcher/src/lib/email.js

@@ -13,6 +13,9 @@ export function extractEmail(from) {
 /**
  * Parse a Gmail "Forwarded message" header block from the body.
  * Returns null if no forwarded header is present.
+ *
+ * Subject may wrap onto following lines without leading whitespace
+ * (Gmail plain-text fold), so we read until the To: line.
  */
 export function parseForwardedHeader(body) {
   if (!body) return null;
@@ -22,14 +25,14 @@ export function parseForwardedHeader(body) {
 
   const after = body.slice(idx);
   const headerMatch = after.match(
-    /From:\s*(.+)\r?\nDate:\s*(.+)\r?\nSubject:\s*(.+)\r?\nTo:\s*(.+)/i,
+    /From:\s*(.+)\r?\nDate:\s*(.+)\r?\nSubject:\s*([\s\S]+?)\r?\nTo:\s*(.+)/i,
   );
   if (!headerMatch) return null;
 
   return {
     from: headerMatch[1].trim(),
     date: headerMatch[2].trim(),
-    subject: headerMatch[3].trim(),
+    subject: headerMatch[3].replace(/\s+/g, " ").trim(),
     to: headerMatch[4].trim(),
   };
 }

apps/watcher/test/fixtures.js

@@ -359,7 +359,8 @@ Roby
 export const tokopediaMultiForwardedBody = `---------- Forwarded message ---------
 From: Tokopedia <noreply@tokopedia.com>
 Date: Fri, Aug 21, 2026 at 12:39 AM
-Subject: Pesanan Selesai: “sandal jepit ANDA pria casual...” dan 1 Item Lainnya
+Subject: Pesanan Selesai: “sandal jepit ANDA pria casual...” dan 1 Item
+Lainnya
 To: <nasyarobby@gmail.com>
 
 Hai *Roby,*

apps/watcher/test/match.test.js

@@ -43,6 +43,16 @@ describe("parseForwardedHeader", () => {
     assert.equal(h.subject, "Pembayaran Berhasil!");
   });
 
+  it("joins wrapped Subject lines before To", () => {
+    const h = parseForwardedHeader(tokopediaMultiForwardedBody);
+    assert.ok(h);
+    assert.match(h.from, /noreply@tokopedia\.com/);
+    assert.equal(
+      h.subject,
+      "Pesanan Selesai: “sandal jepit ANDA pria casual...” dan 1 Item Lainnya",
+    );
+  });
+
   it("returns null when there is no Fwd block", () => {
     assert.equal(parseForwardedHeader(livinDirectBody), null);
   });