feat: avoid imported busy time in Week Ahead export (Closes #1210)

frontend/index.html

@@ -536,7 +536,7 @@
     <section class="week-calendar-handoff" id="week-calendar-handoff" aria-labelledby="week-calendar-title" hidden>
       <div class="small">Calendar handoff</div>
       <h2 id="week-calendar-title">Add Week Ahead to calendar</h2>
-      <p class="small muted">Choose each day’s start time and exclude anything private. Titles, references, dates, and times are included in a local calendar file; nothing is uploaded.</p>
+      <p class="small muted">Titles, references, dates, and times are included in a local calendar file; nothing is uploaded. Imported busy time is used only until this page reloads; otherwise times follow the chosen start.</p>
       <div class="week-calendar-days" id="week-calendar-days"></div>
       <div class="small week-calendar-status" id="week-calendar-status" role="status" aria-live="assertive"></div>
       <div class="week-calendar-actions">