test: fix Windows-only test failures so CI matrix runs clean

Two pre-existing Windows-specific failures blocked the CI release
matrix from publishing the Windows build:

  - tests/main/DailyNotes.test.js: 'joins dir + YYYY-MM-DD.md' used
    a hard-coded '/tmp/notes/2026-09-13.md' expected value. On
    POSIX path.join returns '/' and the test passes; on Windows
    path.join returns '\' and the test fails. Fix: build the
    expected value via path.join so it matches the platform.

  - tests/main/PDFBatchOperations.test.js: 'watermarks every PDF
    including subfolders' used the default 5s Jest timeout. Windows
    CI runners are slower at pdf-lib / pdfjs-dist cold-start and the
    test regularly exceeded 5s. Fix: jest.setTimeout(30000) at the
    start of the watermark describe block.

Neither is a regression — both predate this session. The fix gets
the Windows job green so the release matrix completes 3/3.

Amit Haridas

tests/main/DailyNotes.test.js

@@ -26,7 +26,11 @@ describe('DailyNotes.dateKey', () => {
 describe('DailyNotes.pathFor', () => {
   test('joins dir + YYYY-MM-DD.md', () => {
     const d = new Date(2026, 8, 13);
-    expect(DailyNotes.pathFor(d, '/tmp/notes', path)).toBe('/tmp/notes/2026-09-13.md');
+    // Use path.join to build the expected value so the test passes on
+    // Windows (where path.join returns backslashes) as well as POSIX.
+    expect(DailyNotes.pathFor(d, '/tmp/notes', path)).toBe(
+      path.join('/tmp/notes', '2026-09-13.md')
+    );
   });
 });
 

tests/main/PDFBatchOperations.test.js

@@ -70,6 +70,10 @@ describe('PDFBatchOperations - runPDFBatchOperation', () => {
   }
 
   describe('watermark across a folder (brief manual-verification stand-in)', () => {
+    // 30s timeout for this batch — creates + watermarks 3 PDFs; the
+    // default 5s is too tight on Windows CI runners where pdf-lib /
+    // pdfjs-dist cold-start can take 10-15s on the first call.
+    jest.setTimeout(30000);
     beforeEach(async () => {
       await writePdfFixture(path.join(inputDir, 'a.pdf'), 2, 'Alpha');
       await writePdfFixture(path.join(inputDir, 'b.pdf'), 3, 'Beta');
@@ -81,6 +85,8 @@ describe('PDFBatchOperations - runPDFBatchOperation', () => {
       // 'DRAFT' extracts back out cleanly via pdfjs; wider centered strings
       // (e.g. 'CONFIDENTIAL') hit a pdfjs-dist text-extraction quirk that
       // truncates the returned item even though the full text is drawn.
+      // 30s timeout — the test creates + watermarks 3 PDFs and the default
+      // 5s is too tight on Windows CI runners.
       const { completion } = await runBatch({
         operation: 'watermark',
         data: {