Bug 37707: (QA follow-up) Fix incorrect bold date expectations in Cypress test

- The test for circulation rules date calculations did not account for
  the start date being bold, only the period endpoint dates
- place_booking.js explicitly adds the selected start date to boldDates
  (boldDates = [new Date(startDate)]), giving it the "title" class
- The verification loop checking for unexpected bold dates then failed
  when it encountered the start date, which was bold but not expected
- Add clearZoneStart to expectedBoldDates to match actual behavior

To test:
- yarn cypress run --spec t/cypress/integration/Circulation/bookingsModalDatePicker_spec.ts
- Verify that the "should handle circulation rules date calculations and visual feedback" test now passes

Signed-off-by: Paul Derscheid <paul.derscheid@lmscloud.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
(cherry picked from commit 9c7b02b365)
Signed-off-by: Jacob O'Mara <Jacob.omara@openfifth.co.uk>

t/cypress/integration/Circulation/bookingsModalDatePicker_spec.ts

@@ -452,6 +452,7 @@ describe("Booking Modal Date Picker Tests", () => {
          *                                             └─ Renewal 1 Period (Days 60-64)
          *
          * Expected Visual Styling:
+         * - Day 50: Bold (start date)
          * - Day 59: Bold (issue period)
          * - Day 64: Bold (renewal 1 period)
          * - Day 69: Bold (renewal 2 period)
@@ -561,9 +562,12 @@ describe("Booking Modal Date Picker Tests", () => {
          */
 
         // Calculate expected bold dates based on circulation rules (like original test)
-        // Bold dates occur at period endpoints: start + issuelength, start + issuelength + renewalperiod, etc.
+        // Bold dates occur at: the start date itself, plus period endpoints
         const expectedBoldDates = [];
 
+        // Start date is always bold (see place_booking.js boldDates = [new Date(startDate)])
+        expectedBoldDates.push(clearZoneStart);
+
         // Issue period end (after issuelength days)
         expectedBoldDates.push(
             clearZoneStart.add(dateTestCirculationRules.issuelength, "day")