fix: accept explicit positive signs in durations

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 #### Review fixes
 
+- Accepted an explicit leading `+` in time estimates and other duration expressions, alongside existing negative durations.
 - Preserved balanced closing parentheses, brackets, and braces in relative file-link filenames while excluding surrounding punctuation.
 - Preserved unsaved archive buffers, serialized simultaneous transfers, and replaced closed archive files only after a complete write. Failed writes, stale source documents, and rejected editor edits keep source tasks intact.
 - Preserved archive task order, sibling project structure, attached comment indentation, and standalone notes when removing empty projects.

src/utils/time.ts

@@ -247,13 +247,13 @@ const Time = {
         normalizedDaysPerWeek = Math.max(1, Number(manDaysPerWeek) || 5);
 
       if (
-        /^\s*-\s*\d/.test(to) &&
+        /^\s*[+-]\s*\d/.test(to) &&
         /\d+(?:\.\d+)?\s*(?:m[dw]|ms|[smhdwy]|seconds?|minutes?|hours?|days?|weeks?|years?)(?=\d|\W|$)/i.test(
           to
         )
       ) {
-        durationSign = -1;
-        to = to.replace(/^\s*-\s*/, '');
+        durationSign = /^\s*-/.test(to) ? -1 : 1;
+        to = to.replace(/^\s*[+-]\s*/, '');
       }
 
       to = to.replace(/(\d+(?:\.\d+)?)\s*mw(?=\d|\W|$)/gi, (match, weeks) => {

test/time.spec.ts

@@ -128,6 +128,14 @@ describe('Time utilities', () => {
     expect(Time.diff(formatted, from, 'man-weeks', 24, 6, 3)).to.equal(formatted);
   });
 
+  it('accepts an explicit positive sign on duration expressions', () => {
+    const from = new Date('2020-01-01T00:00:00Z');
+
+    expect(Time.durationSeconds('+1h 30m', from)).to.equal(90 * 60);
+    expect(Time.diffSeconds(' + 2md 1h', from, 8, 5)).to.equal(17 * 3600);
+    expect(Time.diff('+1h 30m', from, 'short')).to.equal('1h 30m');
+  });
+
   it('applies a leading sign to complete man-time durations', () => {
     const from = new Date('2020-01-01T00:00:00Z'),
       negativeManDay = Time.diff(