/events and /morning read the clock on his wall (V-612)

Three defects on the server-rendered pages.

/events printed both timestamps in whatever zone the value arrived in.
NoticedAt is the bus's local instant; OccurredAt is the store's UTC, or a
pubDate internal/rss parsed to UTC. So one row carried two zones and a feed
item read hours older than it was, on a page whose hint tells him that column
gap is real.

/morning printed a plan item's At raw. It is a calendar fact's Ts or a
reminder's FireTs, both UTC out of the store, so the same reminder named a
different hour here than on /reminders — which does call Local, since V-469.

promoteCandidate read the importance select inside `if due != nil`.
Confirming a candidate as "срочно" with no deadline threw the word away and
the row came back normal with nothing saying why.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

cmd/mavweb/tasks_test.go

@@ -32,6 +32,31 @@ type fakeTaskCore struct {
 	statusErr error
 
 	promoted bool
+
+	// The promote path's two extra writes.
+	fields   []any
+	edits    []editCall
+	editErr  error
+	fieldErr error
+}
+
+// editCall records one EditTask, so a test can say what the form actually sent
+// down rather than only that the promotion succeeded.
+type editCall struct {
+	ID     int64
+	Text   string
+	Due    *time.Time
+	Weight int
+}
+
+func (f *fakeTaskCore) EditTask(_ context.Context, id int64, text string, due *time.Time, weight int) error {
+	f.edits = append(f.edits, editCall{id, text, due, weight})
+	return f.editErr
+}
+
+func (f *fakeTaskCore) SetTaskFields(_ context.Context, id int64, doneWhen, blockedOn string) error {
+	f.fields = append(f.fields, []any{id, doneWhen, blockedOn})
+	return f.fieldErr
 }
 
 func (f *fakeTaskCore) ListTasks(_ context.Context, status string) ([]ipc.Task, error) {
@@ -220,6 +245,49 @@ func TestApplyTaskPostCarriesWeight(t *testing.T) {
 	}
 }
 
+// Confirming a candidate posts the importance select whether or not a date is
+// set. The weight write hung off `if due != nil`, so "срочно" with no deadline
+// was read off the form and thrown away, and the row came back normal.
+func TestPromoteCandidateCarriesWeightWithoutADueDate(t *testing.T) {
+	core := &fakeTaskCore{}
+	form := url.Values{
+		"action": {"promote"}, "id": {"4"}, "text": {"продлить страховку"},
+		"done_when": {"полис на руках"}, "weight": {"3"},
+	}
+	req := httptest.NewRequest(http.MethodPost, "/tasks", strings.NewReader(form.Encode()))
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	handleTasks(httptest.NewRecorder(), req, core)
+
+	if len(core.edits) != 1 {
+		t.Fatalf("edits = %+v, want the weight written once", core.edits)
+	}
+	if core.edits[0].Weight != 3 || core.edits[0].ID != 4 {
+		t.Errorf("edit = %+v, want id 4 at weight 3", core.edits[0])
+	}
+	if core.edits[0].Due != nil {
+		t.Errorf("edit invented a due date: %v", core.edits[0].Due)
+	}
+	if core.statusVal != "open" {
+		t.Errorf("status = %q, want the candidate promoted", core.statusVal)
+	}
+}
+
+// A promote with neither field set still writes nothing: the row is unchanged
+// apart from its status, and an EditTask here would be a no-op that can fail.
+func TestPromoteCandidateWithNoDateAndNoWeightDoesNotEdit(t *testing.T) {
+	core := &fakeTaskCore{}
+	form := url.Values{
+		"action": {"promote"}, "id": {"4"}, "text": {"продлить страховку"},
+		"done_when": {"полис на руках"}, "weight": {"0"},
+	}
+	req := httptest.NewRequest(http.MethodPost, "/tasks", strings.NewReader(form.Encode()))
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	handleTasks(httptest.NewRecorder(), req, core)
+	if len(core.edits) != 0 {
+		t.Errorf("edits = %+v, want none", core.edits)
+	}
+}
+
 // Out of range clamps rather than 400s; a non-number is a real client error.
 func TestApplyTaskPostClampsWeight(t *testing.T) {
 	core := &fakeTaskCore{created: true}